Ignore should-scroll-on-main-thread if main frame is not scrollable

cc/layers/scrollbar_layer_unittest.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/layers/scrollbar_layer.h"
 
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/scrollbar_layer_impl.h"
 #include "cc/quads/solid_color_draw_quad.h"
@@ skipping 67 matching lines @@
   LayerImpl* layer_impl_tree_root =
       LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), false);
   ScrollbarLayerImpl* scrollbar_layer_impl =
       static_cast<ScrollbarLayerImpl*>(layer_impl_tree_root->children()[1]);
 
   // When the scrollbar is not an overlay scrollbar, the scroll should be
   // responded to on the main thread as the compositor does not yet implement
   // scrollbar scrolling.
   EXPECT_EQ(InputHandler::ScrollOnMainThread,
             scrollbar_layer_impl->TryScroll(gfx::Point(0, 0),
-                                            InputHandler::Gesture));
+                                            InputHandler::Gesture,
+                                            true));
 
   // Create and attach an overlay scrollbar.
   scrollbar.reset(new FakeScrollbar(false, false, true));
 
   layer_impl_tree_root =
       LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), false);
   scrollbar_layer_impl =
       static_cast<ScrollbarLayerImpl*>(layer_impl_tree_root->children()[1]);
 
   // The user shouldn't be able to drag an overlay scrollbar and the scroll
   // may be handled in the compositor.
   EXPECT_EQ(InputHandler::ScrollIgnored,
             scrollbar_layer_impl->TryScroll(gfx::Point(0, 0),
-                                            InputHandler::Gesture));
+                                            InputHandler::Gesture,
+                                            true));
 }
 
 TEST(ScrollbarLayerTest, ScrollOffsetSynchronization) {
   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
 
   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
   scoped_refptr<Layer> layer_tree_root = Layer::Create();
   scoped_refptr<Layer> content_layer = Layer::Create();
   scoped_refptr<Layer> scrollbar_layer =
       ScrollbarLayer::Create(scrollbar.Pass(),
@@ skipping 454 matching lines @@
 
 TEST_F(ScaledScrollbarLayerTestResourceCreation, ScaledResourceUpload) {
   layer_tree_settings_.solid_color_scrollbars = false;
   // Pick a test scale that moves the scrollbar's (non-zero) position to
   // a non-pixel-aligned location.
   TestResourceUpload(2, 1.41f);
 }
 
 }  // namespace
 }  // namespace cc