AW: add @Override to fix compile warnings in glue layer

No change in logic.

This adds @Override annotations to fix compile warnings in WebView's
glue layer.

Bug: 779716
Test: ninja system_webview_google_apk (rebuild glue, look for compile warnings)
Change-Id: I73096eaec795a9956993ed34f7d1508c0d19e01f
Reviewed-on: https://chromium-review.googlesource.com/744962Reviewed-by: Tao Bai <michaelbai@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513050}

android_webview/glue/java/src/com/android/webview/chromium/ContentSettingsAdapter.java

@@ -611,10 +611,12 @@ public class ContentSettingsAdapter extends android.webkit.WebSettings {
         return mAwSettings.getOffscreenPreRaster();
     }
 
+    @Override
     public void setDisabledActionModeMenuItems(int menuItems) {
         mAwSettings.setDisabledActionModeMenuItems(menuItems);
     }
 
+    @Override
     public int getDisabledActionModeMenuItems() {
         return mAwSettings.getDisabledActionModeMenuItems();
     }

android_webview/glue/java/src/com/android/webview/chromium/ServiceWorkerClientAdapter.java

@@ -82,8 +82,7 @@ public class ServiceWorkerClientAdapter extends AwServiceWorkerClient {
             return mRequest.requestHeaders;
         }
 
-        // TODO(mnaganov): Uncomment when we completely switch builds to the next API level.
-        //@Override
+        @Override
         public boolean isRedirect() {
             return mRequest.isRedirect;
         }

android_webview/glue/java/src/com/android/webview/chromium/WebMessagePortAdapter.java

@@ -25,18 +25,22 @@ public class WebMessagePortAdapter extends WebMessagePort {
         mPort = port;
     }
 
+    @Override
     public void postMessage(WebMessage message) {
         mPort.postMessage(message.getData(), toMessagePorts(message.getPorts()));
     }
 
+    @Override
     public void close() {
         mPort.close();
     }
 
+    @Override
     public void setWebMessageCallback(WebMessageCallback callback) {
         setWebMessageCallback(callback, null);
     }
 
+    @Override
     public void setWebMessageCallback(final WebMessageCallback callback, final Handler handler) {
         mPort.setMessageCallback(new MessagePort.MessageCallback() {
             @Override

android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java

@@ -1541,6 +1541,7 @@ class WebViewChromium implements WebViewProvider, WebViewProvider.ScrollDelegate
         return (TextClassifier) mAwContents.getTextClassifier();
     }
 
+    @Override
     public void autofill(final SparseArray<AutofillValue> values) {
         mFactory.startYourEngines(false);
         if (checkNeedsPost()) {
@@ -2128,26 +2129,31 @@ class WebViewChromium implements WebViewProvider, WebViewProvider.ScrollDelegate
 
     // Overrides method added to WebViewProvider.ViewDelegate interface
     // (not called in M and below)
+    @Override
     public Handler getHandler(Handler originalHandler) {
         return originalHandler;
     }
 
     // Overrides method added to WebViewProvider.ViewDelegate interface
     // (not called in M and below)
+    @Override
     public View findFocus(View originalFocusedView) {
         return originalFocusedView;
     }
 
     // Remove from superclass
+    @Override
     public void preDispatchDraw(Canvas canvas) {
         // TODO(leandrogracia): remove this method from WebViewProvider if we think
         // we won't need it again.
     }
 
+    @Override
     public void onStartTemporaryDetach() {
         mAwContents.onStartTemporaryDetach();
     }
 
+    @Override
     public void onFinishTemporaryDetach() {
         mAwContents.onFinishTemporaryDetach();
     }

android_webview/glue/java/src/com/android/webview/chromium/WebViewChromiumFactoryProvider.java

@@ -687,6 +687,7 @@ public class WebViewChromiumFactoryProvider implements WebViewFactoryProvider {
         return (ServiceWorkerController) mServiceWorkerController;
     }
 
+    @Override
     public TokenBindingService getTokenBindingService() {
         synchronized (mLock) {
             if (mTokenBindingManager == null) {

android_webview/glue/java/src/com/android/webview/chromium/WebViewContentsClientAdapter.java

@@ -295,8 +295,7 @@ class WebViewContentsClientAdapter extends AwContentsClient {
             return mRequest.requestHeaders;
         }
 
-        // TODO(mnaganov): Uncomment when we completely switch builds to the next API level.
-        //@Override
+        @Override
         public boolean isRedirect() {
             return mRequest.isRedirect;
         }
@@ -310,10 +309,12 @@ class WebViewContentsClientAdapter extends AwContentsClient {
             mError = error;
         }
 
+        @Override
         public int getErrorCode() {
             return mError.errorCode;
         }
 
+        @Override
         public CharSequence getDescription() {
             return mError.description;
         }