<webview>: Move PreHandleGestureEvent in chrome

content/public/browser/browser_plugin_guest_delegate.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_PLUGIN_GUEST_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_PLUGIN_GUEST_DELEGATE_H_
 
 #include "base/callback_forward.h"
 #include "base/process/kill.h"
 #include "base/strings/string16.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
 #include "content/public/common/media_stream_request.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/size.h"
 #include "url/gurl.h"
 
+namespace blink {
+class WebGestureEvent;
+}  // namespace blink
+
 namespace content {
 
 class ColorChooser;
 class JavaScriptDialogManager;
 class WebContents;
 struct ColorSuggestion;
 struct ContextMenuParams;
 struct FileChooserParams;
 struct NativeWebKeyboardEvent;
 struct OpenURLParams;
@@ skipping 168 matching lines @@
                                   int opener_render_frame_id,
                                   const base::string16& frame_name,
                                   const GURL& target_url,
                                   WebContents* new_contents) {}
 
   // Registers a |callback| with the delegate that the delegate would call when
   // it is about to be destroyed.
   typedef base::Callback<void(WebContents*)> DestructionCallback;
   virtual void RegisterDestructionCallback(
       const DestructionCallback& callback) {}
+
+  // Allows delegates to handle gesture events before sending to the renderer.
+  // Returns true if the |event| was handled and thus shouldn't be processed
+  // by the renderer's event handler. Note that the touch events that create
+  // the gesture are always passed to the renderer since the gesture is created
+  // and dispatched after the touches return without being "preventDefault()"ed.
+  // TODO(fsamuel): Delete this once BrowserPluginGuest is no longer a
+  // WebContentsDelegate.
+  virtual bool PreHandleGestureEvent(WebContents* source,
+                                     const blink::WebGestureEvent& event);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_PLUGIN_GUEST_DELEGATE_H_