[Android] Allow custom ActionMode creation via ContentViewClient

android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java

Index: android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java b/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
index 168ea650dc363f9fb2864854ff82336e1d4c93a3..a397d79c76c910261a87183a619acccc8de8314a 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
@@ -20,6 +20,8 @@ import android.widget.FrameLayout;
 import org.chromium.content.browser.ContentVideoViewClient;
 import org.chromium.content.browser.ContentViewClient;
 import org.chromium.content.browser.ContentViewCore;
+import org.chromium.content.browser.SelectActionMode;
+import org.chromium.content.browser.SelectActionModeCallback.ActionHandler;
 
 import java.net.URISyntaxException;
 
@@ -106,6 +108,17 @@ public class AwContentViewClient extends ContentViewClient implements ContentVid
     }
 
     @Override
+    public SelectActionMode startActionMode(
+            View view, ActionHandler actionHandler, boolean floating) {
+        return mAwContentsClient.startActionMode(view, actionHandler, floating);
+    }
+
+    @Override
+    public boolean supportsFloatingActionMode() {
+        return mAwContentsClient.supportsFloatingActionMode();
+    }
+
+    @Override
     public final ContentVideoViewClient getContentVideoViewClient() {
         return this;
     }