Add Java wrapper for RenderFrameHost

content/public/android/javatests/src/org/chromium/content/browser/webcontents/WebContentsTest.java

Index: content/public/android/javatests/src/org/chromium/content/browser/webcontents/WebContentsTest.java
diff --git a/content/public/android/javatests/src/org/chromium/content/browser/webcontents/WebContentsTest.java b/content/public/android/javatests/src/org/chromium/content/browser/webcontents/WebContentsTest.java
index fa52a8a74a4d752255c60147f1a1ff1c8a3dbc14..e3b1e348636e28ab90a5c19b3db99829a8b6118d 100644
--- a/content/public/android/javatests/src/org/chromium/content/browser/webcontents/WebContentsTest.java
+++ b/content/public/android/javatests/src/org/chromium/content/browser/webcontents/WebContentsTest.java
@@ -11,6 +11,7 @@ import android.os.Parcel;
 import android.support.test.filters.SmallTest;
 
 import org.chromium.base.ThreadUtils;
+import org.chromium.content_public.browser.RenderFrameHost;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_shell.Shell;
 import org.chromium.content_shell_apk.ContentShellActivity;
@@ -310,6 +311,36 @@ public class WebContentsTest extends ContentShellTestBase {
         }
     }
 
+    /**
+     * Check that the main frame associated with the WebContents is not null
+     * and corresponds with the test URL.
+     *
+     * @throws InterruptedException
+     */
+    @SmallTest
+    public void testWebContentsMainFrame() throws InterruptedException {
+        final ContentShellActivity activity = launchContentShellWithUrl(TEST_URL_1);
+        waitForActiveShellToBeDoneLoading();
+        final WebContents webContents = activity.getActiveWebContents();
+
+        ThreadUtils.postOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                RenderFrameHost frameHost = webContents.getMainFrame();
+
+                assertNotNull(frameHost);
+
+                // FIXME: make this work with PlzNavigate.
+                // assertEquals("RenderFrameHost has incorrect last committed URL", "about:blank",
+                //        frameHost.getLastCommittedURL());
+
+                WebContents associatedWebContents = WebContentsImpl.fromRenderFrameHost(frameHost);
+                assertEquals("RenderFrameHost associated with different WebContents", webContents,
+                        associatedWebContents);
+            }
+        });
+    }
+
     private boolean isWebContentsDestroyed(final WebContents webContents) {
         return ThreadUtils.runOnUiThreadBlockingNoException(new Callable<Boolean>() {
             @Override