chrome: Support Chrome and DevTools command execution (fixes #3282, fixes #3600)

Add new CefBrowserHost::[Can]ExecuteChromeCommand methods for executing
arbitrary Chrome commands.

Add support for existing CefBrowserHost::ShowDevTools, CloseDevTools and
HasDevTools methods.

DevTools windows now support the same Views callbacks as normal popup
windows with the new CefLifeSpanHandler::OnBeforeDevToolsPopup callback
as the DevTools-specific equivalent of OnBeforePopup.

Always create DevTools as an undocked window to support use of
ShowDevTools with default Chrome browser windows.

To test:

Run `ceftests --enable-chrome-runtime [--use-views]
     --gtest_filter=V8Test.OnUncaughtExceptionDevTools`

OR:

1. Run `cefclient --enable-chrome-runtime [--use-native]`
2. Select "Show DevTools", "Close DevTools" or "Inspect" from the
   right-click menu.
3. Notice that the DevTools window is Views-hosted (or native-hosted)
   and works as expected.

Add --use-default-popup to get a default styled popup in step 3.

libcef_dll/cpptoc/life_span_handler_cpptoc.cc

@@ -9,7 +9,7 @@
 // implementations. See the translator.README.txt file in the tools directory
 // for more information.
 //
-// $hash=e96fe0660b55afa20c3bb5fdebc85635ccc53d09$
+// $hash=4990c06888649a2cb06ba7028f16f9cd762f3ad0$
 //
 
 #include "libcef_dll/cpptoc/life_span_handler_cpptoc.h"
@@ -169,6 +169,126 @@ int CEF_CALLBACK life_span_handler_on_before_popup(
   return _retval;
 }
 
+void CEF_CALLBACK life_span_handler_on_before_dev_tools_popup(
+    struct _cef_life_span_handler_t* self,
+    cef_browser_t* browser,
+    cef_window_info_t* windowInfo,
+    cef_client_t** client,
+    struct _cef_browser_settings_t* settings,
+    struct _cef_dictionary_value_t** extra_info,
+    int* use_default_window) {
+  shutdown_checker::AssertNotShutdown();
+
+  // AUTO-GENERATED CONTENT - DELETE THIS COMMENT BEFORE MODIFYING
+
+  DCHECK(self);
+  if (!self) {
+    return;
+  }
+  // Verify param: browser; type: refptr_diff
+  DCHECK(browser);
+  if (!browser) {
+    return;
+  }
+  // Verify param: windowInfo; type: struct_byref
+  DCHECK(windowInfo);
+  if (!windowInfo) {
+    return;
+  }
+  if (!template_util::has_valid_size(windowInfo)) {
+    DCHECK(false) << "invalid windowInfo->[base.]size";
+    return;
+  }
+  // Verify param: client; type: refptr_same_byref
+  DCHECK(client);
+  if (!client) {
+    return;
+  }
+  // Verify param: settings; type: struct_byref
+  DCHECK(settings);
+  if (!settings) {
+    return;
+  }
+  if (!template_util::has_valid_size(settings)) {
+    DCHECK(false) << "invalid settings->[base.]size";
+    return;
+  }
+  // Verify param: extra_info; type: refptr_diff_byref
+  DCHECK(extra_info);
+  if (!extra_info) {
+    return;
+  }
+  // Verify param: use_default_window; type: bool_byaddr
+  DCHECK(use_default_window);
+  if (!use_default_window) {
+    return;
+  }
+
+  // Translate param: windowInfo; type: struct_byref
+  CefWindowInfo windowInfoObj;
+  if (windowInfo) {
+    windowInfoObj.AttachTo(*windowInfo);
+  }
+  // Translate param: client; type: refptr_same_byref
+  CefRefPtr<CefClient> clientPtr;
+  if (client && *client) {
+    clientPtr = CefClientCppToC::Unwrap(*client);
+  }
+  CefClient* clientOrig = clientPtr.get();
+  // Translate param: settings; type: struct_byref
+  CefBrowserSettings settingsObj;
+  if (settings) {
+    settingsObj.AttachTo(*settings);
+  }
+  // Translate param: extra_info; type: refptr_diff_byref
+  CefRefPtr<CefDictionaryValue> extra_infoPtr;
+  if (extra_info && *extra_info) {
+    extra_infoPtr = CefDictionaryValueCToCpp::Wrap(*extra_info);
+  }
+  CefDictionaryValue* extra_infoOrig = extra_infoPtr.get();
+  // Translate param: use_default_window; type: bool_byaddr
+  bool use_default_windowBool =
+      (use_default_window && *use_default_window) ? true : false;
+
+  // Execute
+  CefLifeSpanHandlerCppToC::Get(self)->OnBeforeDevToolsPopup(
+      CefBrowserCToCpp::Wrap(browser), windowInfoObj, clientPtr, settingsObj,
+      extra_infoPtr, &use_default_windowBool);
+
+  // Restore param: windowInfo; type: struct_byref
+  if (windowInfo) {
+    windowInfoObj.DetachTo(*windowInfo);
+  }
+  // Restore param: client; type: refptr_same_byref
+  if (client) {
+    if (clientPtr.get()) {
+      if (clientPtr.get() != clientOrig) {
+        *client = CefClientCppToC::Wrap(clientPtr);
+      }
+    } else {
+      *client = nullptr;
+    }
+  }
+  // Restore param: settings; type: struct_byref
+  if (settings) {
+    settingsObj.DetachTo(*settings);
+  }
+  // Restore param: extra_info; type: refptr_diff_byref
+  if (extra_info) {
+    if (extra_infoPtr.get()) {
+      if (extra_infoPtr.get() != extra_infoOrig) {
+        *extra_info = CefDictionaryValueCToCpp::Unwrap(extra_infoPtr);
+      }
+    } else {
+      *extra_info = nullptr;
+    }
+  }
+  // Restore param: use_default_window; type: bool_byaddr
+  if (use_default_window) {
+    *use_default_window = use_default_windowBool ? true : false;
+  }
+}
+
 void CEF_CALLBACK
 life_span_handler_on_after_created(struct _cef_life_span_handler_t* self,
                                    cef_browser_t* browser) {
@@ -244,6 +364,8 @@ life_span_handler_on_before_close(struct _cef_life_span_handler_t* self,
 
 CefLifeSpanHandlerCppToC::CefLifeSpanHandlerCppToC() {
   GetStruct()->on_before_popup = life_span_handler_on_before_popup;
+  GetStruct()->on_before_dev_tools_popup =
+      life_span_handler_on_before_dev_tools_popup;
   GetStruct()->on_after_created = life_span_handler_on_after_created;
   GetStruct()->do_close = life_span_handler_do_close;
   GetStruct()->on_before_close = life_span_handler_on_before_close;