aw: Expose setDrawGLFunctionDetachedCallback to AwContents

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 a36596dd53b04abed61132ab7af1a074f6810f35..03752d9151f890ae0d667bc595e5447e52d94510 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -170,6 +170,14 @@ public class AwContents implements SmartClipProvider,
      */
     public interface NativeGLDelegate {
         /**
+         * Set the callback for when the getAwDrawGLFunction objects is safe to be deleted
+         * for this view. The callback forms a lifecycle between requestDrawGL (with canvas).
+         *
+         * @return false if not supported and this is a no-op; true otherwise.
+         */
+        boolean setDrawGLFunctionDetachedCallback(View view, Runnable callback);
+
+        /**
          * Requests a callback on the native DrawGL method (see getAwDrawGLFunction)
          * if called from within onDraw, |canvas| will be non-null and hardware accelerated.
          * Otherwise, |canvas| will be null, and the container view itself will be hardware
@@ -2325,9 +2333,6 @@ public class AwContents implements SmartClipProvider,
         mAwViewMethods.onDetachedFromWindow();
     }
 
-    public void onDrawGLFunctorDetached() {
-    }
-
     /**
      * @see android.view.View#onWindowFocusChanged()
      */