[DevTools] Force page redraw when enabling screencast.

content/renderer/render_view_impl.cc

 // 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/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 1615 matching lines @@
   scoped_ptr<cc::SwapPromiseMonitor> latency_info_swap_promise_monitor;
   if (RenderWidgetCompositor* rwc = compositor()) {
     latency_info_swap_promise_monitor =
         rwc->CreateLatencyInfoSwapPromiseMonitor(&latency_info).Pass();
   }
   ScheduleCompositeWithForcedRedraw();
 }
 
 void RenderViewImpl::OnForceRedraw(int id) {
   ui::LatencyInfo latency_info;
-  latency_info.AddLatencyNumber(ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT,
-                                0,
-                                id);
+  if (id) {
+    latency_info.AddLatencyNumber(ui::WINDOW_SNAPSHOT_FRAME_NUMBER_COMPONENT,
+                                  0,
+                                  id);
+  }
   scoped_ptr<cc::SwapPromiseMonitor> latency_info_swap_promise_monitor;
   if (RenderWidgetCompositor* rwc = compositor()) {
     latency_info_swap_promise_monitor =
         rwc->CreateLatencyInfoSwapPromiseMonitor(&latency_info).Pass();
   }
   ScheduleCompositeWithForcedRedraw();
 }
 
 void RenderViewImpl::OnWindowSnapshotCompleted(const int snapshot_id,
     const gfx::Size& size, const std::vector<unsigned char>& png) {
@@ skipping 2641 matching lines @@
     std::vector<gfx::Size> sizes;
     ConvertToFaviconSizes(icon_urls[i].sizes(), &sizes);
     if (!url.isEmpty())
       urls.push_back(
           FaviconURL(url, ToFaviconType(icon_urls[i].iconType()), sizes));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content