Restore CefRenderProcessHandler::OnBeforeNavigation (issue #1076). This method is still needed for some use cases due to issue #1129.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1519 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/capi/cef_render_process_handler_capi.h

@@ -94,6 +94,17 @@ typedef struct _cef_render_process_handler_t {
   struct _cef_load_handler_t* (CEF_CALLBACK *get_load_handler)(
       struct _cef_render_process_handler_t* self);
 
+  ///
+  // Called before browser navigation. Return true (1) to cancel the navigation
+  // or false (0) to allow the navigation to proceed. The |request| object
+  // cannot be modified in this callback.
+  ///
+  int (CEF_CALLBACK *on_before_navigation)(
+      struct _cef_render_process_handler_t* self,
+      struct _cef_browser_t* browser, struct _cef_frame_t* frame,
+      struct _cef_request_t* request,
+      enum cef_navigation_type_t navigation_type, int is_redirect);
+
   ///
   // Called immediately after the V8 context for a frame has been created. To
   // retrieve the JavaScript 'window' object use the

include/cef_render_process_handler.h

@@ -55,6 +55,8 @@
 /*--cef(source=client)--*/
 class CefRenderProcessHandler : public virtual CefBase {
  public:
+  typedef cef_navigation_type_t NavigationType;
+
   ///
   // Called after the render process main thread has been created. |extra_info|
   // is a read-only value originating from
@@ -92,6 +94,18 @@ class CefRenderProcessHandler : public virtual CefBase {
     return NULL;
   }
 
+  ///
+  // Called before browser navigation. Return true to cancel the navigation or
+  // false to allow the navigation to proceed. The |request| object cannot be
+  // modified in this callback.
+  ///
+  /*--cef()--*/
+  virtual bool OnBeforeNavigation(CefRefPtr<CefBrowser> browser,
+                                  CefRefPtr<CefFrame> frame,
+                                  CefRefPtr<CefRequest> request,
+                                  NavigationType navigation_type,
+                                  bool is_redirect) { return false; }
+
   ///
   // Called immediately after the V8 context for a frame has been created. To
   // retrieve the JavaScript 'window' object use the CefV8Context::GetGlobal()

include/internal/cef_types.h

@@ -1479,6 +1479,18 @@ enum cef_focus_source_t {
   FOCUS_SOURCE_SYSTEM,
 };
 
+///
+// Navigation types.
+///
+enum cef_navigation_type_t {
+  NAVIGATION_LINK_CLICKED = 0,
+  NAVIGATION_FORM_SUBMITTED,
+  NAVIGATION_BACK_FORWARD,
+  NAVIGATION_RELOAD,
+  NAVIGATION_FORM_RESUBMITTED,
+  NAVIGATION_OTHER,
+};
+
 ///
 // Supported XML encoding types. The parser supports ASCII, ISO-8859-1, and
 // UTF16 (LE and BE) by default. All other types must be translated to UTF8