Don't suppress HW compositing on the new file manager (chrome://files).

chrome/browser/chrome_content_browser_client.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 "chrome/browser/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 1244 matching lines @@
 AccessTokenStore* ChromeContentBrowserClient::CreateAccessTokenStore() {
   return new ChromeAccessTokenStore();
 }
 
 bool ChromeContentBrowserClient::IsFastShutdownPossible() {
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   return !browser_command_line.HasSwitch(switches::kChromeFrame);
 }
 
 void ChromeContentBrowserClient::OverrideWebkitPrefs(
-    RenderViewHost* rvh, WebPreferences* web_prefs) {
+    RenderViewHost* rvh, const GURL& url, WebPreferences* web_prefs) {
   Profile* profile = Profile::FromBrowserContext(
       rvh->process()->GetBrowserContext());
   PrefService* prefs = profile->GetPrefs();
 
   web_prefs->standard_font_family =
       UTF8ToUTF16(prefs->GetString(prefs::kWebKitGlobalStandardFontFamily));
   web_prefs->fixed_font_family =
       UTF8ToUTF16(prefs->GetString(prefs::kWebKitGlobalFixedFontFamily));
   web_prefs->serif_font_family =
       UTF8ToUTF16(prefs->GetString(prefs::kWebKitGlobalSerifFontFamily));
@@ skipping 119 matching lines @@
              chrome::VIEW_TYPE_BACKGROUND_CONTENTS) {
     // Disable all kinds of acceleration for background pages.
     // See http://crbug.com/96005 and http://crbug.com/96006
     web_prefs->force_compositing_mode = false;
     web_prefs->accelerated_compositing_enabled = false;
     web_prefs->accelerated_2d_canvas_enabled = false;
     web_prefs->accelerated_video_enabled = false;
     web_prefs->accelerated_painting_enabled = false;
     web_prefs->accelerated_plugins_enabled = false;
   }
+
+#if defined(FILE_MANAGER_EXTENSION)
+  // Override the default of suppressing HW compositing for WebUI pages for the
+  // file manager, which is implemented using WebUI but wants HW acceleration
+  // for video decode & render.
+  if (url.spec() == chrome::kChromeUIFileManagerURL) {
+    web_prefs->accelerated_compositing_enabled = true;
+    web_prefs->accelerated_2d_canvas_enabled = true;
+  }
+#endif
 }
 
 void ChromeContentBrowserClient::UpdateInspectorSetting(
     RenderViewHost* rvh, const std::string& key, const std::string& value) {
   content::BrowserContext* browser_context =
       rvh->process()->GetBrowserContext();
   DictionaryPrefUpdate update(
       Profile::FromBrowserContext(browser_context)->GetPrefs(),
       prefs::kWebKitInspectorSettings);
   DictionaryValue* inspector_settings = update.Get();
@@ skipping 103 matching lines @@
 #if defined(USE_NSS)
 crypto::CryptoModuleBlockingPasswordDelegate*
     ChromeContentBrowserClient::GetCryptoPasswordDelegate(
         const GURL& url) {
   return browser::NewCryptoModuleBlockingDialogDelegate(
       browser::kCryptoModulePasswordKeygen, url.host());
 }
 #endif
 
 }  // namespace chrome