Add new CanZoom/Zoom API (fixes #3284)

Add a simpler CanZoom/Zoom API as an alternative to the more error-prone
SetZoomLevel/GetZoomLevel API. Both APIs are now implemented for both runtimes.
With the Chrome runtime a zoom notification bubble will be displayed unless
CefBrowserSettings.chrome_zoom_bubble is set to STATE_DISABLED.

To test:
- Run cefclient and select zoom entries from the Tests menu.
- chrome: Run cefclient with `--hide-chrome-bubbles` command-line flag to hide
  the zoom notification bubble.

include/capi/cef_browser_capi.h

@@ -33,7 +33,7 @@
 // by hand. See the translator.README.txt file in the tools directory for
 // more information.
 //
-// $hash=683d7bff8da04826eee83c7e23cf9c5a701ae265$
+// $hash=db4fce1215cb4f69346ef2d048974ba34187b2b1$
 //
 
 #ifndef CEF_INCLUDE_CAPI_CEF_BROWSER_CAPI_H_
@@ -365,16 +365,39 @@ typedef struct _cef_browser_host_t {
       struct _cef_browser_host_t* self);
 
   ///
-  /// Get the current zoom level. The default zoom level is 0.0. This function
-  /// can only be called on the UI thread.
+  /// Returns true (1) if this browser can execute the specified zoom command.
+  /// This function can only be called on the UI thread.
+  ///
+  int(CEF_CALLBACK* can_zoom)(struct _cef_browser_host_t* self,
+                              cef_zoom_command_t command);
+
+  ///
+  /// Execute a zoom command in this browser. If called on the UI thread the
+  /// change will be applied immediately. Otherwise, the change will be applied
+  /// asynchronously on the UI thread.
+  ///
+  void(CEF_CALLBACK* zoom)(struct _cef_browser_host_t* self,
+                           cef_zoom_command_t command);
+
+  ///
+  /// Get the default zoom level. This value will be 0.0 by default but can be
+  /// configured with the Chrome runtime. This function can only be called on
+  /// the UI thread.
+  ///
+  double(CEF_CALLBACK* get_default_zoom_level)(
+      struct _cef_browser_host_t* self);
+
+  ///
+  /// Get the current zoom level. This function can only be called on the UI
+  /// thread.
   ///
   double(CEF_CALLBACK* get_zoom_level)(struct _cef_browser_host_t* self);
 
   ///
   /// Change the zoom level to the specified value. Specify 0.0 to reset the
-  /// zoom level. If called on the UI thread the change will be applied
-  /// immediately. Otherwise, the change will be applied asynchronously on the
-  /// UI thread.
+  /// zoom level to the default. If called on the UI thread the change will be
+  /// applied immediately. Otherwise, the change will be applied asynchronously
+  /// on the UI thread.
   ///
   void(CEF_CALLBACK* set_zoom_level)(struct _cef_browser_host_t* self,
                                      double zoomLevel);

include/cef_api_hash.h

@@ -42,13 +42,13 @@
 // way that may cause binary incompatibility with other builds. The universal
 // hash value will change if any platform is affected whereas the platform hash
 // values will change only if that particular platform is affected.
-#define CEF_API_HASH_UNIVERSAL "fb95812349ecedc56374e2d195b4af712f6f9ab3"
+#define CEF_API_HASH_UNIVERSAL "abeac9ee5411570f5e39d9242cba575a19439f86"
 #if defined(OS_WIN)
-#define CEF_API_HASH_PLATFORM "4b12d27bf02871c32719580c1be18d686e20bc84"
+#define CEF_API_HASH_PLATFORM "85fba672bea98e3687ccfc28c4a509ca70240990"
 #elif defined(OS_MAC)
-#define CEF_API_HASH_PLATFORM "e6b30ef107ccb6ba9af40bd6498ad4cef247a171"
+#define CEF_API_HASH_PLATFORM "3c960598536b6e112d3857d19d01f05e49474f86"
 #elif defined(OS_LINUX)
-#define CEF_API_HASH_PLATFORM "a4ec73cc821ea2d1681c7f8271f0a7d3e3cea33a"
+#define CEF_API_HASH_PLATFORM "821845ef5f7ea8618f7425a4096702205f4b346b"
 #endif
 
 #ifdef __cplusplus

include/cef_browser.h

@@ -396,17 +396,40 @@ class CefBrowserHost : public virtual CefBaseRefCounted {
   virtual CefRefPtr<CefRequestContext> GetRequestContext() = 0;
 
   ///
-  /// Get the current zoom level. The default zoom level is 0.0. This method can
-  /// only be called on the UI thread.
+  /// Returns true if this browser can execute the specified zoom command. This
+  /// method can only be called on the UI thread.
+  ///
+  /*--cef()--*/
+  virtual bool CanZoom(cef_zoom_command_t command) = 0;
+
+  ///
+  /// Execute a zoom command in this browser. If called on the UI thread the
+  /// change will be applied immediately. Otherwise, the change will be applied
+  /// asynchronously on the UI thread.
+  ///
+  /*--cef()--*/
+  virtual void Zoom(cef_zoom_command_t command) = 0;
+
+  ///
+  /// Get the default zoom level. This value will be 0.0 by default but can be
+  /// configured with the Chrome runtime. This method can only be called on the
+  /// UI thread.
+  ///
+  /*--cef()--*/
+  virtual double GetDefaultZoomLevel() = 0;
+
+  ///
+  /// Get the current zoom level. This method can only be called on the UI
+  /// thread.
   ///
   /*--cef()--*/
   virtual double GetZoomLevel() = 0;
 
   ///
   /// Change the zoom level to the specified value. Specify 0.0 to reset the
-  /// zoom level. If called on the UI thread the change will be applied
-  /// immediately. Otherwise, the change will be applied asynchronously on the
-  /// UI thread.
+  /// zoom level to the default. If called on the UI thread the change will be
+  /// applied immediately. Otherwise, the change will be applied asynchronously
+  /// on the UI thread.
   ///
   /*--cef()--*/
   virtual void SetZoomLevel(double zoomLevel) = 0;

include/internal/cef_types.h

@@ -687,6 +687,12 @@ typedef struct _cef_browser_settings_t {
   /// https://www.chromium.org/user-experience/status-bubble/
   ///
   cef_state_t chrome_status_bubble;
+
+  ///
+  /// Controls whether the Chrome zoom bubble will be shown when zooming. Only
+  /// supported with the Chrome runtime.
+  ///
+  cef_state_t chrome_zoom_bubble;
 } cef_browser_settings_t;
 
 ///
@@ -3660,6 +3666,15 @@ typedef enum {
   CEF_GESTURE_COMMAND_FORWARD,
 } cef_gesture_command_t;
 
+///
+/// Specifies the zoom commands supported by CefBrowserHost::Zoom.
+///
+typedef enum {
+  CEF_ZOOM_COMMAND_OUT,
+  CEF_ZOOM_COMMAND_RESET,
+  CEF_ZOOM_COMMAND_IN,
+} cef_zoom_command_t;
+
 #ifdef __cplusplus
 }
 #endif

include/internal/cef_types_wrappers.h

@@ -541,6 +541,7 @@ struct CefBrowserSettingsTraits {
                    &target->accept_language_list, copy);
 
     target->chrome_status_bubble = src->chrome_status_bubble;
+    target->chrome_zoom_bubble = src->chrome_zoom_bubble;
   }
 };