Set up Finch experiment for expanded GPU rasterization trigger

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"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/alias.h"
 #include "base/debug/trace_event.h"
 #include "base/files/file_path.h"
 #include "base/i18n/rtl.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/process/kill.h"
 #include "base/process/process.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 432 matching lines @@
 
   if (command_line.HasSwitch(switches::kDisableAcceleratedFixedRootBackground))
     return false;
 
   if (command_line.HasSwitch(switches::kEnableAcceleratedFixedRootBackground))
     return true;
 
   return DeviceScaleEnsuresTextQuality(device_scale_factor);
 }
 
+static bool ShouldUseExpandedHeuristicsForGpuRasterization() {
+  const char kGpuRasterizationContentWhitelistFieldTrialName[] =
+      "GpuRasterizationExpandedContentWhitelist";
+  const char kGpuRasterizationContentWhitelistFieldTrialEnabledName[] =
+      "Enabled";
+
+  return base::FieldTrialList::FindFullName(
+             kGpuRasterizationContentWhitelistFieldTrialName) ==

[Alexei Svitkine (slow), 2014/06/04 18:05:09]

Nit: I think it's cleaner without the extra constants - just inline the literals
into the call and cond.

[ajuma, 2014/06/04 18:25:33]

Done.

+         kGpuRasterizationContentWhitelistFieldTrialEnabledName;
+}
+
 static FaviconURL::IconType ToFaviconType(blink::WebIconURL::Type type) {
   switch (type) {
     case blink::WebIconURL::TypeFavicon:
       return FaviconURL::FAVICON;
     case blink::WebIconURL::TypeTouch:
       return FaviconURL::TOUCH_ICON;
     case blink::WebIconURL::TypeTouchPrecomposed:
       return FaviconURL::TOUCH_PRECOMPOSED_ICON;
     case blink::WebIconURL::TypeInvalid:
       return FaviconURL::INVALID_ICON;
@@ skipping 259 matching lines @@
   webview()->settings()->setAcceleratedCompositingForOverflowScrollEnabled(
       ShouldUseAcceleratedCompositingForOverflowScroll(device_scale_factor_));
   webview()->settings()->setCompositorDrivenAcceleratedScrollingEnabled(
       ShouldUseUniversalAcceleratedCompositingForOverflowScroll());
   webview()->settings()->setAcceleratedCompositingForTransitionEnabled(
       ShouldUseTransitionCompositing(device_scale_factor_));
   webview()->settings()->setAcceleratedCompositingForFixedRootBackgroundEnabled(
       ShouldUseAcceleratedFixedRootBackground(device_scale_factor_));
   webview()->settings()->setCompositedScrollingForFramesEnabled(
       ShouldUseCompositedScrollingForFrames(device_scale_factor_));
+  webview()->settings()->setUseExpandedHeuristicsForGpuRasterization(
+      ShouldUseExpandedHeuristicsForGpuRasterization());
 
   ApplyWebPreferences(webkit_preferences_, webview());
 
   webview()->settings()->setAllowConnectingInsecureWebSocket(
       command_line.HasSwitch(switches::kAllowInsecureWebSocketFromHttpsOrigin));
 
   main_render_frame_.reset(main_render_frame);
   webview()->setMainFrame(main_render_frame_->GetWebFrame());
   main_render_frame_->Initialize();
 
@@ skipping 3287 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