android webview: Keep zoom methods synchronous

content/renderer/android/synchronous_compositor_proxy.h

 // Copyright 2015 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_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_
 #define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 91 matching lines @@
                     IPC::Message* reply_message);
   void SetSharedMemory(
       const SyncCompositorCommonBrowserParams& common_params,
       const SyncCompositorSetSharedMemoryParams& params,
       bool* success,
       SyncCompositorCommonRendererParams* common_renderer_params);
   void ZeroSharedMemory();
   void DemandDrawSw(const SyncCompositorCommonBrowserParams& common_params,
                     const SyncCompositorDemandDrawSwParams& params,
                     IPC::Message* reply_message);
+  void SynchronousUpdateState(
+      const SyncCompositorCommonBrowserParams& common_params,
+      SyncCompositorCommonRendererParams* common_renderer_params);
 
   void SwapBuffersHw(uint32_t output_surface_id, cc::CompositorFrame* frame);
   void SendDemandDrawHwReply(cc::CompositorFrame* frame,
                              uint32_t output_surface_id,
                              IPC::Message* reply_message);
   void DoDemandDrawSw(const SyncCompositorDemandDrawSwParams& params);
   void SwapBuffersSw(cc::CompositorFrame* frame);
   void SendDemandDrawSwReply(bool success,
                              cc::CompositorFrame* frame,
                              IPC::Message* reply_message);
@@ skipping 28 matching lines @@
   uint32_t need_invalidate_count_;
   bool need_begin_frame_;
   uint32_t did_activate_pending_tree_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_