Adding command line flag for enabling accelerated compositing.

This CL cannot be checked in until the patch for:
https://bugs.webkit.org/show_bug.cgi?id=39917
has landed.
BUG=45373
Review URL: http://codereview.chromium.org/2330004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@48754 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 9 insertions, 1 deletions

diff --git a/chrome/browser/tab_contents/render_view_host_delegate_helper.cc b/chrome/browser/tab_contents/render_view_host_delegate_helper.cc
index 2d84d45..2d80f2aa 100644
--- a/chrome/browser/tab_contents/render_view_host_delegate_helper.cc
+++ b/chrome/browser/tab_contents/render_view_host_delegate_helper.cc
@@ -240,6 +240,8 @@ WebPreferences RenderViewHostDelegateHelper::GetWebkitPrefs(
         command_line.HasSwitch(switches::kAllowFileAccessFromFiles);
     web_prefs.show_composited_layer_borders =
         command_line.HasSwitch(switches::kShowCompositedLayerBorders);
+    web_prefs.accelerated_compositing_enabled =
+        command_line.HasSwitch(switches::kEnableAcceleratedCompositing);
     // The user stylesheet watcher may not exist in a testing profile.
     if (profile->GetUserStyleSheetWatcher()) {
       web_prefs.user_style_sheet_enabled = true;
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 42dc6fc..4690749 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -249,6 +249,9 @@ const char kDomAutomationController[]       = "dom-automation";
 // scripts.
 const char kDumpHistogramsOnExit[]          = "dump-histograms-on-exit";
 
+// Enable gpu-accelerated compositing.
+const char kEnableAcceleratedCompositing[]  = "enable-accelerated-compositing";
+
 // Enables AeroPeek for each tab. (This switch only works on Windows 7).
 const char kEnableAeroPeekTabs[]            = "enable-aero-peek-tabs";
 
diff --git a/chrome/common/chrome_switches.h b/chrome/common/chrome_switches.h
index a68f61c..b4df9c9 100644
--- a/chrome/common/chrome_switches.h
+++ b/chrome/common/chrome_switches.h
@@ -86,6 +86,7 @@ extern const char kDnsLogDetails[];
 extern const char kDnsPrefetchDisable[];
 extern const char kDomAutomationController[];
 extern const char kDumpHistogramsOnExit[];
+extern const char kEnableAcceleratedCompositing[];
 extern const char kEnableAeroPeekTabs[];
 extern const char kEnableApps[];
 extern const char kEnableAuthNegotiatePort[];
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index 3a224e0..0f6419c 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -1660,6 +1660,7 @@ struct ParamTraits<WebPreferences> {
     WriteParam(m, p.allow_file_access_from_file_urls);
     WriteParam(m, p.experimental_webgl_enabled);
     WriteParam(m, p.show_composited_layer_borders);
+    WriteParam(m, p.accelerated_compositing_enabled);
   }
   static bool Read(const Message* m, void** iter, param_type* p) {
     return
@@ -1702,7 +1703,8 @@ struct ParamTraits<WebPreferences> {
         ReadParam(m, iter, &p->allow_universal_access_from_file_urls) &&
         ReadParam(m, iter, &p->allow_file_access_from_file_urls) &&
         ReadParam(m, iter, &p->experimental_webgl_enabled) &&
-        ReadParam(m, iter, &p->show_composited_layer_borders);
+        ReadParam(m, iter, &p->show_composited_layer_borders) &&
+        ReadParam(m, iter, &p->accelerated_compositing_enabled);
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(L"<WebPreferences>");