Add a bit to not bubble scrolls to parent scrolling layers

cc/layer_tree_host_unittest_scroll.cc

 // Copyright 2012 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 "cc/layer_tree_host.h"
 
 #include "cc/content_layer.h"
 #include "cc/layer.h"
 #include "cc/layer_impl.h"
 #include "cc/layer_tree_impl.h"
@@ skipping 357 matching lines @@
 
     switch (impl->activeTree()->source_frame_number()) {
       case 0: {
         // Gesture scroll on impl thread.
         InputHandlerClient::ScrollStatus status = impl->scrollBegin(
             gfx::ToCeiledPoint(
                 expected_scroll_layer_impl->position() +
                 gfx::Vector2dF(0.5f, 0.5f)),
             InputHandlerClient::Gesture);
         EXPECT_EQ(InputHandlerClient::ScrollStarted, status);
-        impl->scrollBy(gfx::Point(), scroll_amount_);
+        impl->scrollBy(gfx::Point(), scroll_amount_, true);
         impl->scrollEnd();
 
         // Check the scroll is applied as a delta.
         EXPECT_VECTOR_EQ(
             initial_offset_,
             expected_scroll_layer_impl->scrollOffset());
         EXPECT_VECTOR_EQ(
             scroll_amount_,
             expected_scroll_layer_impl->scrollDelta());
         break;
       }
       case 1: {
         // Wheel scroll on impl thread.
         InputHandlerClient::ScrollStatus status = impl->scrollBegin(
             gfx::ToCeiledPoint(
                 expected_scroll_layer_impl->position() +
                 gfx::Vector2dF(0.5f, 0.5f)),
             InputHandlerClient::Wheel);
         EXPECT_EQ(InputHandlerClient::ScrollStarted, status);
-        impl->scrollBy(gfx::Point(), scroll_amount_);
+        impl->scrollBy(gfx::Point(), scroll_amount_, true);
         impl->scrollEnd();
 
         // Check the scroll is applied as a delta.
         EXPECT_VECTOR_EQ(
             javascript_scroll_,
             expected_scroll_layer_impl->scrollOffset());
         EXPECT_VECTOR_EQ(
             scroll_amount_,
             expected_scroll_layer_impl->scrollDelta());
         break;
@@ skipping 204 matching lines @@
   gfx::Vector2d impl_thread_scroll1_;
   gfx::Vector2d impl_thread_scroll2_;
   int num_scrolls_;
   bool can_activate_;
 };
 
 MULTI_THREAD_TEST_F(ImplSidePaintingScrollTestSimple);
 
 }  // namespace
 }  // namespace cc