Add a group policy for hardware acceleration.

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index a4b6255b1ef72610ff12afe4b15d228016dbd7cd..c6ba1946db5f1016a296f630b74f25cd8400951e 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -3837,4 +3837,32 @@ IN_PROC_BROWSER_TEST_F(PolicyTest, NativeMessagingWhitelist) {
 
 #endif  // !defined(CHROME_OS)
 
+// Sets the hardware acceleration mode policy before the browser is started.
+class HardwareAccelerationModePolicyTest : public PolicyTest {
+ public:
+  HardwareAccelerationModePolicyTest() {}
+  ~HardwareAccelerationModePolicyTest() override {}

[bartfab (slow), 2015/07/01 09:16:54]

Nit: No need to override the destructor here.

[Zhenyao Mo, 2015/07/01 17:56:07]

Done.

+
+  void SetUpInProcessBrowserTestFixture() override {
+    PolicyTest::SetUpInProcessBrowserTestFixture();
+    PolicyMap policies;
+    policies.Set(key::kHardwareAccelerationModeEnabled,
+                 POLICY_LEVEL_MANDATORY,
+                 POLICY_SCOPE_USER,
+                 new base::FundamentalValue(false),
+                 NULL);
+    provider_.UpdateChromePolicy(policies);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(PolicyTest, HardwareAccelerationEnabledByDefault) {
+  EXPECT_TRUE(content::GpuDataManager::GetInstance()->GpuAccessAllowed(NULL));

[bartfab (slow), 2015/07/01 09:16:54]

1: Nit: s/NULL/nullptr/
2: PolicyTest.Disable3DAPIs seems to assume that hardware acceleration may not
always be available in tests (e.g. unavailable when running under Xvfb?). Please
make sure the test actually works under Xvfb and on bots.

[Zhenyao Mo, 2015/07/01 17:56:07]

Although it seems to run OK on all try bots, but I agree this is fragile,
because we might just block the GPUs on future bots through software rendering
list.  Remove this test.

+}
+
+IN_PROC_BROWSER_TEST_F(HardwareAccelerationModePolicyTest,
+                       HardwareAccelerationDisabled) {
+  // Verifies that hardware acceleration can be disabled with policy.
+  EXPECT_FALSE(content::GpuDataManager::GetInstance()->GpuAccessAllowed(NULL));
+}
+
 }  // namespace policy