Turn GPU accelerated features (WebGL, compositing, accelerated 2d canvas) off for background pages

We don't support turning compositing on for a background page currently and it doesn't seem necessary.  This disables all GPU-requiring features for background pages for now.  When we have valid use cases we can re-enable features as needed.

BUG=64512
TEST=load extension that uses 3d CSS in a background page and verify that there is no browser crash or GPU process created on startup

Review URL: http://codereview.chromium.org/5369008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@68130 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 17 insertions, 0 deletions

diff --git a/chrome/browser/extensions/extension_browsertests_misc.cc b/chrome/browser/extensions/extension_browsertests_misc.cc
index d9828a1..f554d11 100644
--- a/chrome/browser/extensions/extension_browsertests_misc.cc
+++ b/chrome/browser/extensions/extension_browsertests_misc.cc
@@ -173,6 +173,23 @@ IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, TabContents) {
   EXPECT_TRUE(result);
 }
 
+// Tests that GPU-related WebKit preferences are set for extension background
+// pages. See http://crbug.com/64512.
+IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, WebKitPrefsBackgroundPage) {
+  ASSERT_TRUE(LoadExtension(
+      test_data_dir_.AppendASCII("good").AppendASCII("Extensions")
+                    .AppendASCII("behllobkkfkfnphdnhnkndlbkcpglgmj")
+                    .AppendASCII("1.0.0.0")));
+
+  ExtensionProcessManager* manager =
+        browser()->profile()->GetExtensionProcessManager();
+  ExtensionHost* host = FindHostWithPath(manager, "/backgroundpage.html", 1);
+  WebPreferences prefs = host->GetWebkitPrefs();
+  ASSERT_FALSE(prefs.experimental_webgl_enabled);
+  ASSERT_FALSE(prefs.accelerated_compositing_enabled);
+  ASSERT_FALSE(prefs.accelerated_2d_canvas_enabled);
+}
+
 // Tests that we can load page actions in the Omnibox.
 IN_PROC_BROWSER_TEST_F(ExtensionBrowserTest, PageAction) {
   ASSERT_TRUE(test_server()->Start());