Back out r58711. It appears to have caused video/media-related ui_tests...

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2010 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include <algorithm>
@@ skipping 542 matching lines @@
     switches::kEnableVideoLayering,
     switches::kEnableVideoLogging,
     switches::kEnableTouch,
     // We propagate the Chrome Frame command line here as well in case the
     // renderer is not run in the sandbox.
     switches::kChromeFrame,
     // We need to propagate this flag to determine whether to make the
     // WebGLArray constructors on the DOMWindow visible. This
     // information is needed very early during bringup. We prefer to
     // use the WebPreferences to set this flag on a page-by-page basis.
-    switches::kDisableExperimentalWebGL,
+    switches::kEnableExperimentalWebGL,
     switches::kDisableGLSLTranslator,
     switches::kInProcessWebGL,
-    switches::kDisableAcceleratedCompositing,
+    switches::kEnableAcceleratedCompositing,
 #if defined(OS_MACOSX)
     // Allow this to be set when invoking the browser and relayed along.
     switches::kEnableSandboxLogging,
     switches::kDisableFlashCoreAnimation,
 #endif
     switches::kRemoteShellPort,
     switches::kEnablePepperTesting,
     switches::kBlockNonSandboxedPlugins,
     switches::kDisableOutdatedPlugins,
     switches::kEnableRemoting,
     switches::kDisableClickToPlay,
     switches::kEnableResourceContentSettings,
     switches::kPrelaunchGpuProcess,
+    switches::kEnableAcceleratedCompositing,
     switches::kEnableAcceleratedDecoding,
     switches::kEnableFileSystem,
   };
   renderer_cmd->CopySwitchesFrom(browser_cmd, kSwitchNames,
                                  arraysize(kSwitchNames));
 
   // Disable databases in incognito mode.
   if (profile()->IsOffTheRecord() &&
       !browser_cmd.HasSwitch(switches::kDisableDatabases)) {
     renderer_cmd->AppendSwitch(switches::kDisableDatabases);
@@ skipping 484 matching lines @@
         IPC::InvalidPlatformFileForTransit(),
         std::vector<std::string>(),
         std::string(),
         false));
   }
 }
 
 void BrowserRenderProcessHost::EnableAutoSpellCorrect(bool enable) {
   Send(new ViewMsg_SpellChecker_EnableAutoSpellCorrect(enable));
 }