Let embedder provide select action mode

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 45a360b4f9da94ff9fe8607a1c29090fe6c44221..c769924ea3fa5650cef7337feb50b83c7a78e6a4 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -804,13 +804,15 @@ public class AwContents implements SmartClipProvider,
         onContainerViewChanged();
     }
 
-    private static void initializeContentViewCore(ContentViewCore contentViewCore,
+    private void initializeContentViewCore(ContentViewCore contentViewCore,
             Context context, ViewAndroidDelegate viewDelegate,
             InternalAccessDelegate internalDispatcher, WebContents webContents,
             GestureStateListener gestureStateListener, ContentViewClient contentViewClient,
             ContentViewCore.ZoomControlsDelegate zoomControlsDelegate,
             WindowAndroid windowAndroid) {
         contentViewCore.initialize(viewDelegate, internalDispatcher, webContents, windowAndroid);
+        contentViewCore.setActionModeCallback(
+                new AwActionModeCallback(this, contentViewCore.getActionModeCallbackHelper()));
         contentViewCore.addGestureStateListener(gestureStateListener);
         contentViewCore.setContentViewClient(contentViewClient);
         contentViewCore.setZoomControlsDelegate(zoomControlsDelegate);