Add initial GpuMemoryBufferSurfaceTexture implementation.

content/public/android/java/src/org/chromium/content/app/ChildProcessService.java

Index: content/public/android/java/src/org/chromium/content/app/ChildProcessService.java
diff --git a/content/public/android/java/src/org/chromium/content/app/ChildProcessService.java b/content/public/android/java/src/org/chromium/content/app/ChildProcessService.java
index 769249ed095bc6568d765df6237b0e1407bba312..f5f3a819caca3ce09afbe111b78f0dc9323669fc 100644
--- a/content/public/android/java/src/org/chromium/content/app/ChildProcessService.java
+++ b/content/public/android/java/src/org/chromium/content/app/ChildProcessService.java
@@ -285,6 +285,22 @@ public class ChildProcessService extends Service {
         }
     }
 
+    @SuppressWarnings("unused")
+    @CalledByNative
+    private Surface getSurfaceTextureSurface(int surfaceTextureId) {
+        if (mCallback == null) {
+            Log.e(TAG, "No callback interface has been provided.");
+            return null;
+        }
+
+        try {
+            return mCallback.getSurfaceTextureSurface(surfaceTextureId);
+        } catch (RemoteException e) {
+            Log.e(TAG, "Unable to call getSurfaceTextureSurface: " + e);
+            return null;
+        }
+    }
+
     /**
      * The main entry point for a child process. This should be called from a new thread since
      * it will not return until the child process exits. See child_process_service.{h,cc}