cc: Use HighResNow as timebase if it is fast and reliable

content/renderer/render_widget.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_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 37 matching lines @@
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebCursorInfo.h"
 #include "third_party/WebKit/public/web/WebHelperPlugin.h"
 #include "third_party/WebKit/public/web/WebPagePopup.h"
 #include "third_party/WebKit/public/web/WebPopupMenu.h"
 #include "third_party/WebKit/public/web/WebPopupMenuInfo.h"
 #include "third_party/WebKit/public/web/WebRange.h"
 #include "third_party/WebKit/public/web/WebScreenInfo.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "ui/base/ui_base_switches.h"
+#include "ui/gfx/frame_time.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/surface/transport_dib.h"
 #include "webkit/renderer/compositor_bindings/web_rendering_stats_impl.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/sys_utils.h"
 #include "content/renderer/android/synchronous_compositor_factory.h"
@@ skipping 1336 matching lines @@
 
   // Suppress updating when we are hidden.
   if (is_hidden_ || size_.IsEmpty() || is_swapped_out_) {
     paint_aggregator_.ClearPendingUpdate();
     needs_repainting_on_restore_ = true;
     TRACE_EVENT0("renderer", "EarlyOut_NotVisible");
     return;
   }
 
   // Tracking of frame rate jitter
-  base::TimeTicks frame_begin_ticks = base::TimeTicks::Now();
+  base::TimeTicks frame_begin_ticks = gfx::FrameTime::Now();
   InstrumentWillBeginFrame();
   AnimateIfNeeded();
 
   // Layout may generate more invalidation.  It may also enable the
   // GPU acceleration, so make sure to run layout before we send the
   // GpuRenderingActivated message.
   webwidget_->layout();
 
   // Check for whether we need to track swap buffers. We need to do that after
   // layout() because it may have switched us to accelerated compositing.
@@ skipping 1359 matching lines @@
           kDefaultCommandBufferSize,
           kDefaultStartTransferBufferSize,
           kDefaultMinTransferBufferSize,
           kDefaultMaxTransferBufferSize,
           mapped_memory_reclaim_limit))
     return scoped_ptr<WebGraphicsContext3DCommandBufferImpl>();
   return context.Pass();
 }
 
 }  // namespace content