Rewire Android WebView's compositor changed signal.

android_webview/browser/child_frame.cc

 // 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.
 
 #include "android_webview/browser/child_frame.h"
 
-#include <utility>
-
 #include "cc/output/compositor_frame.h"
 
 namespace android_webview {
 
 ChildFrame::ChildFrame(uint32_t output_surface_id,
                        std::unique_ptr<cc::CompositorFrame> frame,
-                       uint32_t compositor_id,
+                       const CompositorID& compositor_id,
                        bool viewport_rect_for_tile_priority_empty,
                        const gfx::Transform& transform_for_tile_priority,
                        bool offscreen_pre_raster,
                        bool is_layer)
     : output_surface_id(output_surface_id),
       frame(std::move(frame)),
       compositor_id(compositor_id),
       viewport_rect_for_tile_priority_empty(
           viewport_rect_for_tile_priority_empty),
       transform_for_tile_priority(transform_for_tile_priority),
       offscreen_pre_raster(offscreen_pre_raster),
       is_layer(is_layer) {}
 
 ChildFrame::~ChildFrame() {
 }
 
 }  // namespace webview