Implement disambiguation popup

content/common/view_messages.h

 // Copyright (c) 2012 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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 1342 matching lines @@
                     IPC::PlatformFileForTransit /* file handle */)
 
 // Temporary message to diagnose an unexpected condition in WebContentsImpl.
 IPC_MESSAGE_CONTROL1(ViewMsg_TempCrashWithData,
                      GURL /* data */)
 
 // Change the accessibility mode in the renderer process.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetAccessibilityMode,
                     AccessibilityMode)
 
+// An acknowledge to ViewHostMsg_MultipleTargetsTouched to notify the renderer
+// process to release the magnified image.
+IPC_MESSAGE_ROUTED1(ViewMsg_ReleaseDisambiguationPopupDIB,
+                    TransportDIB::Handle /* DIB handle */)
+
 // -----------------------------------------------------------------------------
 // Messages sent from the renderer to the browser.
 
 // Sent by the renderer when it is creating a new window.  The browser creates
 // a tab for it and responds with a ViewMsg_CreatingNew_ACK.  If route_id is
 // MSG_ROUTING_NONE, the view couldn't be created.
 IPC_SYNC_MESSAGE_CONTROL1_3(ViewHostMsg_CreateWindow,
                             ViewHostMsg_CreateWindow_Params,
                             int /* route_id */,
                             int32 /* surface_id */,
@@ skipping 900 matching lines @@
 // * id - (integer) the frame identifier in this RenderView
 // * name - (string) the name of the frame, if one has been assigned
 // * subtree - an array of the same type of objects for each frame that is a
 //     direct child of the current frame. This property can be omitted if
 //     there are no direct child frames, so less data is transferred.
 //
 // This message must be sent on any events that modify the tree structure or
 // the names of any frames.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_FrameTreeUpdated,
                     std::string /* json encoded frame tree */)
+
+// Notifies that multiple touch targets may have been pressed, and to show
+// the disambiguation popup.
+IPC_MESSAGE_ROUTED3(ViewHostMsg_ShowDisambiguationPopup,
+                    gfx::Rect, /* Border of touched targets */
+                    gfx::Size, /* Size of zoomed image */
+                    TransportDIB::Id /* DIB of zoomed image */)