Make cc::CompositorFrames movable [Part 1 of 2]

content/browser/renderer_host/render_widget_host_view_mac.mm

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 1460 matching lines @@
 
 bool RenderWidgetHostViewMac::HasAcceleratedSurface(
       const gfx::Size& desired_size) {
   if (browser_compositor_) {
     return browser_compositor_->accelerated_widget_mac()->HasFrameOfSize(
         desired_size);
   }
   return false;
 }
 
-void RenderWidgetHostViewMac::OnSwapCompositorFrame(
-    uint32_t output_surface_id,
-    std::unique_ptr<cc::CompositorFrame> frame) {
+void RenderWidgetHostViewMac::OnSwapCompositorFrame(uint32_t output_surface_id,
+                                                    cc::CompositorFrame frame) {
   TRACE_EVENT0("browser", "RenderWidgetHostViewMac::OnSwapCompositorFrame");
 
-  last_scroll_offset_ = frame->metadata.root_scroll_offset;
+  last_scroll_offset_ = frame.metadata.root_scroll_offset;
 
-  page_at_minimum_scale_ = frame->metadata.page_scale_factor ==
-                           frame->metadata.min_page_scale_factor;
+  page_at_minimum_scale_ =
+      frame.metadata.page_scale_factor == frame.metadata.min_page_scale_factor;
 
-  if (frame->delegated_frame_data) {
-    float scale_factor = frame->metadata.device_scale_factor;
+  if (frame.delegated_frame_data) {
+    float scale_factor = frame.metadata.device_scale_factor;
 
     // Compute the frame size based on the root render pass rect size.
     cc::RenderPass* root_pass =
-        frame->delegated_frame_data->render_pass_list.back().get();
+        frame.delegated_frame_data->render_pass_list.back().get();
     gfx::Size pixel_size = root_pass->output_rect.size();
     gfx::Size dip_size = gfx::ConvertSizeToDIP(scale_factor, pixel_size);
 
     root_layer_->SetBounds(gfx::Rect(dip_size));
     if (!render_widget_host_->is_hidden()) {
       EnsureBrowserCompositorView();
       browser_compositor_->compositor()->SetScaleAndSize(
           scale_factor, pixel_size);
     }
 
@@ skipping 1932 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end