Create Java infrastructure for UI Render Tests.

chrome/android/javatests/src/org/chromium/chrome/browser/ntp/NewTabPageTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/ntp/NewTabPageTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/NewTabPageTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/NewTabPageTest.java
index 3a94395b06bc52698451ae6b4abea4a2562f095a..d8478fa063b41091d19ef3bf87841f2f2aef5a58 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/NewTabPageTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/ntp/NewTabPageTest.java
@@ -16,8 +16,10 @@ import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.DisableIf;
 import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
+import org.chromium.base.test.util.RenderTest;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.ntp.cards.NewTabPageRecyclerView;
 import org.chromium.chrome.browser.omnibox.LocationBarLayout;
 import org.chromium.chrome.browser.omnibox.UrlBar;
 import org.chromium.chrome.browser.tab.EmptyTabObserver;
@@ -26,6 +28,7 @@ import org.chromium.chrome.test.ChromeTabbedActivityTestBase;
 import org.chromium.chrome.test.util.ChromeTabUtils;
 import org.chromium.chrome.test.util.NewTabPageTestUtils;
 import org.chromium.chrome.test.util.OmniboxTestUtils;
+import org.chromium.chrome.test.util.RenderUtils.ViewRenderer;
 import org.chromium.content.browser.test.util.CallbackHelper;
 import org.chromium.content.browser.test.util.Criteria;
 import org.chromium.content.browser.test.util.CriteriaHelper;
@@ -36,6 +39,7 @@ import org.chromium.net.test.EmbeddedTestServer;
 import org.chromium.net.test.util.TestWebServer;
 import org.chromium.ui.base.PageTransition;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.concurrent.Callable;
 import java.util.concurrent.Semaphore;
@@ -59,6 +63,35 @@ public class NewTabPageTest extends ChromeTabbedActivityTestBase {
     private FakeMostVisitedSites mFakeMostVisitedSites;
     private EmbeddedTestServer mTestServer;
 
+    @RenderTest()
+    @Feature({"NewTabPage"})
+    public void testRender() throws IOException, InterruptedException {
+        ViewRenderer viewRenderer = new ViewRenderer(getActivity(), "NewTabPageTest");
+        viewRenderer.save(mMostVisitedLayout, "most_visited");
+        viewRenderer.save(mFakebox, "fakebox");
+        viewRenderer.save(mNtp.getView(), "new_tab_page");
+
+        // Scroll to search bar
+        final NewTabPageRecyclerView recyclerView = (NewTabPageRecyclerView)
+                mNtp.getNewTabPageView().findViewById(R.id.ntp_scrollview);
+
+        ThreadUtils.runOnUiThreadBlocking(new Runnable() {
+            @Override
+            public void run() {
+                recyclerView.smoothScrollBy(0, mFakebox.getTop());
+            }
+        });
+
+        CriteriaHelper.pollUiThread(new Criteria(){
+            @Override
+            public boolean isSatisfied() {
+                return recyclerView.computeVerticalScrollOffset() == mFakebox.getTop();
+            }
+        });
+
+        viewRenderer.save(mNtp.getView(), "new_tab_page_scrolled");

[jbudorick, 2016/07/01 15:34:21]

The more I think about it, the more I think that we should really be doing the
golden comparison in the test rather than on the host. I know that may make
things a little trickier for rebaselining, but I think we can come up with
something reasonable to do for that case.

[PEConn, 2016/07/01 16:46:13]

OK, I can see the benefits of that - it requires much less change to the host
infrastructure. In regards to the tests I've written, all I really need to do is
change ViewRenderer.save to ViewRenderer.compare and put all the logic there.

[jbudorick, 2016/07/01 16:50:20]

Also, if we do device-side comparison, I'm not sure if we need @RenderTest at
all (and we certainly don't need the directory in the annotation data).

+    }
+
     @Override
     protected void setUp() throws Exception {
         mTestServer = EmbeddedTestServer.createAndStartFileServer(