aura: Use the WindowSlider for gesture-nav while the page is reloading.

content/browser/web_contents/aura/window_slider_unittest.cc

 // Copyright (c) 2013 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/web_contents/aura/window_slider.h"
 
 #include "base/bind.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/aura_test_base.h"
@@ skipping 42 matching lines @@
  private:
   // Overridden from aura::WindowDelegate:
   virtual bool HasHitTestMask() const OVERRIDE { return true; }
 
   DISALLOW_COPY_AND_ASSIGN(NoEventWindowDelegate);
 };
 
 class WindowSliderDelegateTest : public WindowSlider::Delegate {
  public:
   WindowSliderDelegateTest()
-      : created_back_layer_(false),
+      : can_create_layer_(true),
+        created_back_layer_(false),
         created_front_layer_(false),
         slide_completed_(false),
         slide_aborted_(false),
         slider_destroyed_(false) {
   }
   virtual ~WindowSliderDelegateTest() {}
 
   void Reset() {
+    can_create_layer_ = true;
     created_back_layer_ = false;
     created_front_layer_ = false;
     slide_completed_ = false;
     slide_aborted_ = false;
     slider_destroyed_ = false;
   }
 
+  void SetCanCreateLayer(bool can_create_layer) {
+    can_create_layer_ = can_create_layer;
+  }
+
   bool created_back_layer() const { return created_back_layer_; }
   bool created_front_layer() const { return created_front_layer_; }
   bool slide_completed() const { return slide_completed_; }
   bool slide_aborted() const { return slide_aborted_; }
   bool slider_destroyed() const { return slider_destroyed_; }
 
  private:
   ui::Layer* CreateLayerForTest() {
+    CHECK(can_create_layer_);
     ui::Layer* layer = new ui::Layer(ui::LAYER_SOLID_COLOR);
     layer->SetColor(SK_ColorRED);
     return layer;
   }
 
   // Overridden from WindowSlider::Delegate:
   virtual ui::Layer* CreateBackLayer() OVERRIDE {
+    if (!can_create_layer_)
+      return NULL;
     created_back_layer_ = true;
     return CreateLayerForTest();
   }
 
   virtual ui::Layer* CreateFrontLayer() OVERRIDE {
+    if (!can_create_layer_)
+      return NULL;
     created_front_layer_ = true;
     return CreateLayerForTest();
   }
 
   virtual void OnWindowSlideComplete() OVERRIDE {
     slide_completed_ = true;
   }
 
   virtual void OnWindowSlideAborted() OVERRIDE {
     slide_aborted_ = true;
   }
 
   virtual void OnWindowSliderDestroyed() OVERRIDE {
     slider_destroyed_ = true;
   }
 
+  bool can_create_layer_;
   bool created_back_layer_;
   bool created_front_layer_;
   bool slide_completed_;
   bool slide_aborted_;
   bool slider_destroyed_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSliderDelegateTest);
 };
 
 typedef aura::test::AuraTestBase WindowSliderTest;
@@ skipping 136 matching lines @@
   aura::Window* new_window = window.get();
   EXPECT_NE(old_window, new_window);
 
   EXPECT_TRUE(slider_delegate.created_back_layer());
   EXPECT_TRUE(slider_delegate.slide_completed());
   EXPECT_FALSE(slider_delegate.created_front_layer());
   EXPECT_FALSE(slider_delegate.slide_aborted());
   EXPECT_TRUE(slider_delegate.slider_destroyed());
 }
 
+TEST_F(WindowSliderTest, NoSlideWhenLayerCantBeCreated) {
+  scoped_ptr<aura::Window> window(CreateNormalWindow(0, root_window(), NULL));
+  window->SetBounds(gfx::Rect(0, 0, 400, 400));
+  WindowSliderDelegateTest slider_delegate;
+  slider_delegate.SetCanCreateLayer(false);
+
+  aura::test::EventGenerator generator(root_window());
+
+  // Generate a horizontal overscroll.
+  new WindowSlider(&slider_delegate, root_window(), window.get());
+  generator.GestureScrollSequence(gfx::Point(10, 10),
+                                  gfx::Point(160, 10),
+                                  base::TimeDelta::FromMilliseconds(10),
+                                  10);
+  EXPECT_FALSE(slider_delegate.created_back_layer());
+  EXPECT_TRUE(slider_delegate.slide_completed());
+  EXPECT_FALSE(slider_delegate.created_front_layer());
+  EXPECT_FALSE(slider_delegate.slide_aborted());
+  EXPECT_TRUE(slider_delegate.slider_destroyed());
+  window->SetTransform(gfx::Transform());
+}
+
 }  // namespace content