[Android] Bail out early in onNativeLibraryLoaded with TextureView.

We do not need to initialize mSurfaceCallback if we are not using
SurfaceView.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1887

[M49 notes: this commit used to be "[Android] Only initialize
 ContentReadbackHandler in onNativeLibraryLoaded for TextureView", and
 had to be reworked because ContentReadbackHandler was removed in
 http://crrev.com/1415803006 and http://crrev.com/1514403002, so we now
 only need to stop earlier when not using SurfaceView]

content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java

@@ -172,11 +172,15 @@ public ContentViewRenderView(Context context, CompositingSurfaceType surfaceType
      * @param rootWindow The {@link WindowAndroid} this render view should be linked to.
      */
     public void onNativeLibraryLoaded(WindowAndroid rootWindow) {
-        assert !mSurfaceView.getHolder().getSurface().isValid() :
-                "Surface created before native library loaded.";
         assert rootWindow != null;
         mNativeContentViewRenderView = nativeInit(rootWindow.getNativePointer());
         assert mNativeContentViewRenderView != 0;
+
+        if (mCompositingSurfaceType == CompositingSurfaceType.TEXTURE_VIEW)
+            return;
+
+        assert !mSurfaceView.getHolder().getSurface().isValid() :
+                "Surface created before native library loaded.";
         mSurfaceCallback = new SurfaceHolder.Callback() {
             @Override
             public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {