Start upstreaming accessibility.

content/shell/android/java/src/org/chromium/content_shell/ContentShellActivity.java

Index: content/shell/android/java/src/org/chromium/content_shell/ContentShellActivity.java
diff --git a/content/shell/android/java/src/org/chromium/content_shell/ContentShellActivity.java b/content/shell/android/java/src/org/chromium/content_shell/ContentShellActivity.java
index 039bef5808cb9f54f94bd30a7bd2dddbca0fbc0a..40b92d11aea37fddd2a7ae4e8389099033a0ba66 100644
--- a/content/shell/android/java/src/org/chromium/content_shell/ContentShellActivity.java
+++ b/content/shell/android/java/src/org/chromium/content_shell/ContentShellActivity.java
@@ -99,6 +99,22 @@ public class ContentShellActivity extends Activity {
         }
     }
 
+    @Override
+    protected void onPause() {
+        ContentView view = getActiveContentView();
+        if (view != null) view.onActivityPause();
+
+        super.onPause();
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        ContentView view = getActiveContentView();
+        if (view != null) view.onActivityResume();
+    }
+
     private static String getUrlFromIntent(Intent intent) {
         return intent != null ? intent.getDataString() : null;
     }
@@ -118,6 +134,15 @@ public class ContentShellActivity extends Activity {
         return mShellManager != null ? mShellManager.getActiveShell() : null;
     }
 
+    /**
+     * @return The {@link ContentView} owned by the currently visible {@link Shell} or null if one
+     *         is not showing.
+     */
+    public ContentView getActiveContentView() {
+        Shell shell = getActiveShell();
+        return shell != null ? shell.getContentView() : null;
+    }
+
     private void initializeContentViewResources() {
         AppResource.DIMENSION_LINK_PREVIEW_OVERLAY_RADIUS = R.dimen.link_preview_overlay_radius;
         AppResource.DRAWABLE_LINK_PREVIEW_POPUP_OVERLAY = R.drawable.popup_zoomer_overlay;