Add missing null-check in OverscrollControllerAndroid::Animate()

content/browser/android/overscroll_controller_android.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/android/overscroll_controller_android.h"
 
 #include "base/android/build_info.h"
 #include "base/command_line.h"
 #include "cc/layers/layer.h"
 #include "cc/output/compositor_frame_metadata.h"
@@ skipping 208 matching lines @@
           gfx::ScaleVector2d(
               params.causal_event_viewport_point.OffsetFromOrigin(),
               dpi_scale_))) {
     SetNeedsAnimate();
   }
 }
 
 bool OverscrollControllerAndroid::Animate(base::TimeTicks current_time,
                                           cc::Layer* parent_layer) {
   DCHECK(parent_layer);
-  if (!enabled_)
+  if (!enabled_ || !glow_effect_)
     return false;
 
   return glow_effect_->Animate(current_time, parent_layer);
 }
 
 void OverscrollControllerAndroid::OnFrameMetadataUpdated(
     const cc::CompositorFrameMetadata& frame_metadata) {
   if (!refresh_effect_ && !glow_effect_)
     return;
 
@@ skipping 45 matching lines @@
 
 scoped_ptr<EdgeEffectBase> OverscrollControllerAndroid::CreateEdgeEffect() {
   return CreateGlowEdgeEffect(&compositor_->GetResourceManager(), dpi_scale_);
 }
 
 void OverscrollControllerAndroid::SetNeedsAnimate() {
   compositor_->SetNeedsAnimate();
 }
 
 }  // namespace content