Ensure the viewport is always represented by the inner viewport layer.

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/bind.h"
@@ skipping 3650 matching lines @@
 
   EXPECT_EQ(top_controls_height_,
             host_impl_->top_controls_manager()->ContentTopOffset());
 
   // Send a gesture scroll that will scroll the outer viewport, make sure the
   // top controls get scrolled.
   gfx::Vector2dF scroll_delta(0.f, 15.f);
   EXPECT_EQ(InputHandler::SCROLL_STARTED,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::GESTURE));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
-  EXPECT_EQ(host_impl_->OuterViewportScrollLayer(),
+  EXPECT_EQ(host_impl_->InnerViewportScrollLayer(),
             host_impl_->CurrentlyScrollingLayer());
   host_impl_->ScrollEnd();
 
   EXPECT_FLOAT_EQ(scroll_delta.y(),
                   top_controls_height_ -
                       host_impl_->top_controls_manager()->ContentTopOffset());
 
   scroll_delta = gfx::Vector2dF(0.f, 50.f);
   EXPECT_EQ(InputHandler::SCROLL_STARTED,
             host_impl_->ScrollBegin(gfx::Point(), InputHandler::GESTURE));
   host_impl_->ScrollBy(gfx::Point(), scroll_delta);
 
   EXPECT_EQ(0, host_impl_->top_controls_manager()->ContentTopOffset());
-  EXPECT_EQ(host_impl_->OuterViewportScrollLayer(),
+  EXPECT_EQ(host_impl_->InnerViewportScrollLayer(),
             host_impl_->CurrentlyScrollingLayer());
 
   host_impl_->ScrollEnd();
 
   // Position the viewports such that the inner viewport will be scrolled.
   gfx::Vector2dF inner_viewport_offset(0.f, 25.f);
   host_impl_->OuterViewportScrollLayer()->SetScrollDelta(gfx::Vector2dF());
   host_impl_->InnerViewportScrollLayer()->SetScrollDelta(inner_viewport_offset);
 
   scroll_delta = gfx::Vector2dF(0.f, -65.f);
@@ skipping 4047 matching lines @@
   {
     gfx::Vector2dF inner_expected;
     gfx::Vector2dF outer_expected;
     EXPECT_VECTOR_EQ(inner_expected, inner_scroll->CurrentScrollOffset());
     EXPECT_VECTOR_EQ(outer_expected, outer_scroll->CurrentScrollOffset());
 
     // Scrolling the viewport always sets the outer scroll layer as the
     // currently scrolling layer.
     EXPECT_EQ(InputHandler::SCROLL_STARTED,
               host_impl_->ScrollBegin(gfx::Point(), InputHandler::GESTURE));
-    EXPECT_EQ(outer_scroll, host_impl_->CurrentlyScrollingLayer());
+    EXPECT_EQ(inner_scroll, host_impl_->CurrentlyScrollingLayer());
     EXPECT_EQ(InputHandler::SCROLL_STARTED, host_impl_->FlingScrollBegin());
-    EXPECT_EQ(outer_scroll, host_impl_->CurrentlyScrollingLayer());
+    EXPECT_EQ(inner_scroll, host_impl_->CurrentlyScrollingLayer());
 
     gfx::Vector2d scroll_delta(inner_viewport.width() / 2.f,
                                inner_viewport.height() / 2.f);
     host_impl_->ScrollBy(gfx::Point(), scroll_delta);
     inner_expected += gfx::Vector2dF(scroll_delta.x(), scroll_delta.y());
-    EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), outer_scroll);
+    EXPECT_EQ(inner_scroll, host_impl_->CurrentlyScrollingLayer());
 
     host_impl_->ScrollEnd();
     EXPECT_EQ(nullptr, host_impl_->CurrentlyScrollingLayer());
 
     EXPECT_VECTOR_EQ(inner_expected, inner_scroll->CurrentScrollOffset());
     EXPECT_VECTOR_EQ(outer_expected, outer_scroll->CurrentScrollOffset());
 
     // Fling past the inner viewport boundry, make sure outer viewport scrolls.
     EXPECT_EQ(InputHandler::SCROLL_STARTED,
               host_impl_->ScrollBegin(gfx::Point(), InputHandler::GESTURE));
-    EXPECT_EQ(outer_scroll, host_impl_->CurrentlyScrollingLayer());
+    EXPECT_EQ(inner_scroll, host_impl_->CurrentlyScrollingLayer());
     EXPECT_EQ(InputHandler::SCROLL_STARTED, host_impl_->FlingScrollBegin());
-    EXPECT_EQ(outer_scroll, host_impl_->CurrentlyScrollingLayer());
+    EXPECT_EQ(inner_scroll, host_impl_->CurrentlyScrollingLayer());
 
     host_impl_->ScrollBy(gfx::Point(), scroll_delta);
     inner_expected += gfx::Vector2dF(scroll_delta.x(), scroll_delta.y());
-    EXPECT_EQ(outer_scroll, host_impl_->CurrentlyScrollingLayer());
+    EXPECT_EQ(inner_scroll, host_impl_->CurrentlyScrollingLayer());
 
     host_impl_->ScrollBy(gfx::Point(), scroll_delta);
     outer_expected += gfx::Vector2dF(scroll_delta.x(), scroll_delta.y());
-    EXPECT_EQ(outer_scroll, host_impl_->CurrentlyScrollingLayer());
+    EXPECT_EQ(inner_scroll, host_impl_->CurrentlyScrollingLayer());
 
     host_impl_->ScrollEnd();
     EXPECT_EQ(nullptr, host_impl_->CurrentlyScrollingLayer());
 
     EXPECT_VECTOR_EQ(inner_expected, inner_scroll->CurrentScrollOffset());
     EXPECT_VECTOR_EQ(outer_expected, outer_scroll->CurrentScrollOffset());
   }
 }
 
 TEST_F(LayerTreeHostImplVirtualViewportTest,
@@ skipping 763 matching lines @@
   // Hold an unowned pointer to the output surface to use for mock expectations.
   MockReclaimResourcesOutputSurface* mock_output_surface = output_surface.get();
 
   CreateHostImpl(DefaultSettings(), output_surface.Pass());
   EXPECT_CALL(*mock_output_surface, ForceReclaimResources()).Times(1);
   host_impl_->BeginCommit();
 }
 
 }  // namespace
 }  // namespace cc