Use black for resize gutter in tab fullscreen mode.

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

 // Copyright (c) 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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 134 matching lines @@
   OverscrollMode current_mode_;
   OverscrollMode completed_mode_;
   float delta_x_;
   float delta_y_;
 
   DISALLOW_COPY_AND_ASSIGN(TestOverscrollDelegate);
 };
 
 class MockRenderWidgetHostDelegate : public RenderWidgetHostDelegate {
  public:
-  MockRenderWidgetHostDelegate() : rwh_(nullptr) {}
+  MockRenderWidgetHostDelegate() : rwh_(nullptr), is_fullscreen_(false) {}
   ~MockRenderWidgetHostDelegate() override {}
   const NativeWebKeyboardEvent* last_event() const { return last_event_.get(); }
   void set_widget_host(RenderWidgetHostImpl* rwh) { rwh_ = rwh; }
+  void set_is_fullscreen(bool is_fullscreen) { is_fullscreen_ = is_fullscreen; }
 
  protected:
   // RenderWidgetHostDelegate:
   bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                               bool* is_keyboard_shortcut) override {
     last_event_.reset(new NativeWebKeyboardEvent(event));
     return true;
   }
   void Cut() override {}
   void Copy() override {}
   void Paste() override {}
   void SelectAll() override {}
   void SendScreenRects() override {
     if (rwh_)
       rwh_->SendScreenRects();
   }
+  bool IsFullscreenForCurrentTab(
+      RenderWidgetHostImpl* render_widget_host) const override {
+    return is_fullscreen_;
+  }
 
  private:
   scoped_ptr<NativeWebKeyboardEvent> last_event_;
   RenderWidgetHostImpl* rwh_;
+  bool is_fullscreen_;
+
   DISALLOW_COPY_AND_ASSIGN(MockRenderWidgetHostDelegate);
 };
 
 // Simple observer that keeps track of changes to a window for tests.
 class TestWindowObserver : public aura::WindowObserver {
  public:
   explicit TestWindowObserver(aura::Window* window_to_observe)
       : window_(window_to_observe) {
     window_->AddObserver(this);
   }
@@ skipping 1521 matching lines @@
   view_->OnSwapCompositorFrame(0, std::move(frame));
 
   ui::Layer* parent_layer = view_->GetNativeView()->layer();
 
   ASSERT_EQ(2u, parent_layer->children().size());
   EXPECT_EQ(gfx::Rect(40, 0, 60, 100), parent_layer->children()[0]->bounds());
   EXPECT_EQ(SK_ColorRED, parent_layer->children()[0]->background_color());
   EXPECT_EQ(gfx::Rect(0, 45, 40, 55), parent_layer->children()[1]->bounds());
   EXPECT_EQ(SK_ColorRED, parent_layer->children()[1]->background_color());
 
+  delegates_.back()->set_is_fullscreen(true);
   view_->SetSize(medium_size);
 
   // Right gutter is unnecessary.
   ASSERT_EQ(1u, parent_layer->children().size());
   EXPECT_EQ(gfx::Rect(0, 45, 40, 50), parent_layer->children()[0]->bounds());
 
+  // RWH is fullscreen, so gutters should be black.
+  EXPECT_EQ(SK_ColorBLACK, parent_layer->children()[0]->background_color());
+
   frame = MakeDelegatedFrame(1.f, medium_size, gfx::Rect(medium_size));
   view_->OnSwapCompositorFrame(0, std::move(frame));
   EXPECT_EQ(0u, parent_layer->children().size());
 
   view_->SetSize(large_size);
   ASSERT_EQ(2u, parent_layer->children().size());
 
   // This should evict the frame and remove the gutter layers.
   view_->Hide();
   view_->SetSize(small_size);
@@ skipping 2736 matching lines @@
   view()->OnGestureEvent(&gesture_event);
 
   EXPECT_TRUE(delegate->context_menu_request_received());
   EXPECT_EQ(delegate->context_menu_source_type(), ui::MENU_SOURCE_TOUCH);
 #endif
 
   RenderViewHostFactory::set_is_real_render_view_host(false);
 }
 
 }  // namespace content