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
new file mode 100644
index 0000000000000000000000000000000000000000..09a8e6a9c4b7a11db2ef30829742e65eef056dff
--- /dev/null
+++ b/content/public/android/javatests/src/org/chromium/content/browser/VSyncPausedTest.java
@@ -0,0 +1,84 @@
+// 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.chromium.base.ThreadUtils;
+import org.chromium.base.test.util.CallbackHelper;
+import org.chromium.content.browser.test.util.JavaScriptUtils;
+import org.chromium.content_public.browser.WebContentsObserver;
+import org.chromium.content_shell_apk.ContentShellTestBase;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * Tests pausing the VSync loop for a WindowAndroid.
+ */
+public class VSyncPausedTest extends ContentShellTestBase {

[boliu, 2017/03/15 22:08:11]

I think a bunch of content tests have been converted to junit4, so use
ContentShellActivityTestRule rather than inheriting from ContentShellTestBase.
Should be able to just look at some other test using
ContentShellActivityTestRule and copy from that.

[mthiesse, 2017/03/16 00:03:07]

Done.

+    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;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+        startActivityWithTestUrl(VSYNC_HTML);
+        mObserver = new WebContentsObserver(getWebContents()) {
+            @Override
+            public void titleWasSet(String title) {
+                mTitle = title;
+                mOnTitleUpdatedHelper.notifyCalled();
+            }
+        };
+        mOnTitleUpdatedHelper = new CallbackHelper();
+    }
+
+    private void fullyLoadUrl(final String url) throws Throwable {

[boliu, 2017/03/15 22:08:11]

not used

[mthiesse, 2017/03/16 00:03:07]

Done.

+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                getActivity().getActiveShell().loadUrl(url);
+            }
+        });
+        waitForActiveShellToBeDoneLoading();
+    }
+
+    @MediumTest
+    public void testPauseVSync() throws Throwable {
+        int callCount = mOnTitleUpdatedHelper.getCallCount();
+        JavaScriptUtils.executeJavaScriptAndWaitForResult(
+                getContentViewCore().getWebContents(), CALL_RAF);
+        mOnTitleUpdatedHelper.waitForCallback(callCount);
+        assertEquals(mTitle, "1");
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                getContentViewCore().getWindowAndroid().setVSyncPaused(true);
+            }
+        });
+        callCount = mOnTitleUpdatedHelper.getCallCount();
+        JavaScriptUtils.executeJavaScriptAndWaitForResult(
+                getContentViewCore().getWebContents(), CALL_RAF);
+        try {
+            mOnTitleUpdatedHelper.waitForCallback(callCount, 1, 1, TimeUnit.SECONDS);
+        } catch (TimeoutException e) {

[boliu, 2017/03/15 22:08:11]

add a comment timeout is expected

[mthiesse, 2017/03/16 00:03:07]

Done.

+        }
+        assertEquals(mTitle, "1");
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                getContentViewCore().getWindowAndroid().setVSyncPaused(false);
+            }
+        });
+        mOnTitleUpdatedHelper.waitForCallback(callCount);
+        assertEquals(mTitle, "2");
+    }
+}