Expose VSync pausing through WindowAndroid and pause VSync during webVR presentation

content/public/android/javatests/src/org/chromium/content/browser/VSyncPausedTest.java

Index: content/public/android/javatests/src/org/chromium/content/browser/VSyncPausedTest.java
diff --git a/content/public/android/javatests/src/org/chromium/content/browser/VSyncPausedTest.java b/content/public/android/javatests/src/org/chromium/content/browser/VSyncPausedTest.java
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+++ b/content/public/android/javatests/src/org/chromium/content/browser/VSyncPausedTest.java
@@ -0,0 +1,114 @@
+// Copyright 2013 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.
+
+package org.chromium.content.browser;
+
+import android.support.test.filters.MediumTest;
+
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.chromium.base.ThreadUtils;
+import org.chromium.base.test.BaseJUnit4ClassRunner;
+import org.chromium.base.test.util.CallbackHelper;
+import org.chromium.base.test.util.UrlUtils;
+import org.chromium.content.browser.test.util.JavaScriptUtils;
+import org.chromium.content_public.browser.WebContentsObserver;
+import org.chromium.content_shell_apk.ContentShellActivity;
+import org.chromium.content_shell_apk.ContentShellActivityTestRule;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * Tests pausing the VSync loop for a WindowAndroid.
+ */
+@RunWith(BaseJUnit4ClassRunner.class)
+public class VSyncPausedTest {
+    @Rule
+    public ContentShellActivityTestRule mActivityTestRule = new ContentShellActivityTestRule();
+
+    private static final String VSYNC_HTML = "content/test/data/android/vsync.html";
+    private static final String CALL_RAF = "window.requestAnimationFrame(onAnimationFrame);";
+
+    private CallbackHelper mOnTitleUpdatedHelper;
+    private String mTitle;
+
+    private WebContentsObserver mObserver;
+    private ContentShellActivity mActivity;
+
+    @Before
+    public void setUp() throws Exception {
+        mActivity = mActivityTestRule.launchContentShellWithUrl(
+                UrlUtils.getIsolatedTestFileUrl(VSYNC_HTML));
+        mActivityTestRule.waitForActiveShellToBeDoneLoading();
+        mObserver = new WebContentsObserver(mActivity.getActiveWebContents()) {
+            @Override
+            public void titleWasSet(String title) {
+                mTitle = title;
+                mOnTitleUpdatedHelper.notifyCalled();
+            }
+        };
+        mOnTitleUpdatedHelper = new CallbackHelper();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        mObserver.destroy();
+    }
+
+    @Test
+    @MediumTest
+    public void testPauseVSync() throws Throwable {
+        int callCount = mOnTitleUpdatedHelper.getCallCount();
+        JavaScriptUtils.executeJavaScriptAndWaitForResult(
+                mActivity.getActiveWebContents(), CALL_RAF);
+        mOnTitleUpdatedHelper.waitForCallback(callCount);
+        Assert.assertEquals("1", mTitle);
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                mActivity.getActiveShell().getContentViewCore().getWindowAndroid().setVSyncPaused(
+                        true);
+            }
+        });
+        callCount = mOnTitleUpdatedHelper.getCallCount();
+        JavaScriptUtils.executeJavaScriptAndWaitForResult(
+                mActivity.getActiveWebContents(), CALL_RAF);
+        try {
+            mOnTitleUpdatedHelper.waitForCallback(callCount, 1, 1, TimeUnit.SECONDS);
+        } catch (TimeoutException e) {
+            // Timeout is expected.
+        }
+        // There may be a VSync already propagating before we pause VSync, so we may receive a
+        // single extra VSync.
+        String expected = "2";
+        if (mTitle.equals("2")) {
+            expected = "3";
+            callCount = mOnTitleUpdatedHelper.getCallCount();
+            // Make sure we don't receive another extra VSync.
+            JavaScriptUtils.executeJavaScriptAndWaitForResult(
+                    mActivity.getActiveWebContents(), CALL_RAF);
+            try {
+                mOnTitleUpdatedHelper.waitForCallback(callCount, 1, 1, TimeUnit.SECONDS);
+            } catch (TimeoutException e) {
+                // Timeout is expected.
+            }
+            Assert.assertEquals("2", mTitle);
+        }
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                mActivity.getActiveShell().getContentViewCore().getWindowAndroid().setVSyncPaused(
+                        false);
+            }
+        });
+        mOnTitleUpdatedHelper.waitForCallback(callCount);
+        Assert.assertEquals(expected, mTitle);
+    }
+}