aura: Clean up compositor initialization/destruction.

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index e44aca55911138d363cd4fdffcb8949514ba6693..401b09553b8f42affcc32b8ee33b2505584a0025 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -645,6 +645,13 @@ class PrerenderBrowserTest : virtual public InProcessBrowserTest {
     return web_contents->GetController().GetDefaultSessionStorageNamespace();
   }
 
+  virtual void SetUp() OVERRIDE {
+    // The GPU Video Decoder needs real GL bindings.
+    UseRealGLBindings();
+
+    InProcessBrowserTest::SetUp();
+  }
+
   virtual void SetUpInProcessBrowserTestFixture() OVERRIDE {
 #if defined(FULL_SAFE_BROWSING)
     SafeBrowsingService::RegisterFactory(safe_browsing_factory_.get());
@@ -2742,6 +2749,10 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
 class PrerenderBrowserTestWithExtensions : public PrerenderBrowserTest,
                                            public ExtensionApiTest {
  public:
+  virtual void SetUp() OVERRIDE {
+    PrerenderBrowserTest::SetUp();
+  }
+
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     PrerenderBrowserTest::SetUpCommandLine(command_line);
     ExtensionApiTest::SetUpCommandLine(command_line);