Move compositor thread input handling logic into content

cc/trees/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/trees/layer_tree_host.h"
 
+#include "base/memory/weak_ptr.h"
 #include "cc/base/thread_impl.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_layer_tree_host_client.h"
 #include "cc/test/geometry_test_utils.h"
 #include "cc/test/layer_tree_test.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebLayerScrollClient.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/vector2d_conversions.h"
 
 namespace cc {
 namespace {
 
 class LayerTreeHostScrollTest : public LayerTreeTest {};
 
 class LayerTreeHostScrollTestScrollSimple : public LayerTreeHostScrollTest {
  public:
   LayerTreeHostScrollTestScrollSimple()
       : initial_scroll_(10, 20),
         second_scroll_(40, 5),
         scroll_amount_(2, -1),
-        num_scrolls_(0) {
-  }
+        num_scrolls_(0) {}
 
   virtual void BeginTest() OVERRIDE {
     layer_tree_host()->root_layer()->SetScrollable(true);
     layer_tree_host()->root_layer()->SetScrollOffset(initial_scroll_);
     PostSetNeedsCommitToMainThread();
   }
 
   virtual void Layout() OVERRIDE {
     Layer* root = layer_tree_host()->root_layer();
     if (!layer_tree_host()->commit_number()) {
@@ skipping 21 matching lines @@
         PostSetNeedsCommitToMainThread();
         break;
       case 1:
         EXPECT_VECTOR_EQ(root->scroll_offset(), second_scroll_);
         EXPECT_VECTOR_EQ(root->ScrollDelta(), scroll_amount_);
         EndTest();
         break;
     }
   }
 
-  virtual void ApplyScrollAndScale(
-      gfx::Vector2d scroll_delta, float scale) OVERRIDE {
+  virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta, float scale)
+      OVERRIDE {
     gfx::Vector2d offset = layer_tree_host()->root_layer()->scroll_offset();
     layer_tree_host()->root_layer()->SetScrollOffset(offset + scroll_delta);
     num_scrolls_++;
   }
 
-  virtual void AfterTest() OVERRIDE {
-    EXPECT_EQ(1, num_scrolls_);
-  }
+  virtual void AfterTest() OVERRIDE { EXPECT_EQ(1, num_scrolls_); }
 
  private:
   gfx::Vector2d initial_scroll_;
   gfx::Vector2d second_scroll_;
   gfx::Vector2d scroll_amount_;
   int num_scrolls_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestScrollSimple);
 
 class LayerTreeHostScrollTestScrollMultipleRedraw
     : public LayerTreeHostScrollTest {
  public:
   LayerTreeHostScrollTestScrollMultipleRedraw()
-      : initial_scroll_(40, 10),
-        scroll_amount_(-3, 17),
-        num_scrolls_(0) {
-  }
+      : initial_scroll_(40, 10), scroll_amount_(-3, 17), num_scrolls_(0) {}
 
   virtual void BeginTest() OVERRIDE {
     layer_tree_host()->root_layer()->SetScrollable(true);
     layer_tree_host()->root_layer()->SetScrollOffset(initial_scroll_);
     PostSetNeedsCommitToMainThread();
   }
 
   virtual void BeginCommitOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     Layer* root = layer_tree_host()->root_layer();
     switch (layer_tree_host()->commit_number()) {
       case 0:
         EXPECT_VECTOR_EQ(root->scroll_offset(), initial_scroll_);
         break;
       case 1:
-        EXPECT_VECTOR_EQ(
-            root->scroll_offset(),
-            initial_scroll_ + scroll_amount_ + scroll_amount_);
+        EXPECT_VECTOR_EQ(root->scroll_offset(),
+                         initial_scroll_ + scroll_amount_ + scroll_amount_);
       case 2:
-        EXPECT_VECTOR_EQ(
-            root->scroll_offset(),
-            initial_scroll_ + scroll_amount_ + scroll_amount_);
+        EXPECT_VECTOR_EQ(root->scroll_offset(),
+                         initial_scroll_ + scroll_amount_ + scroll_amount_);
         break;
     }
   }
 
   virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     LayerImpl* root = impl->active_tree()->root_layer();
     root->SetScrollable(true);
     root->SetMaxScrollOffset(gfx::Vector2d(100, 100));
 
     if (impl->active_tree()->source_frame_number() == 0 &&
@@ skipping 11 matching lines @@
       EXPECT_EQ(root->ScrollDelta(), scroll_amount_);
       root->ScrollBy(scroll_amount_);
       EXPECT_VECTOR_EQ(root->ScrollDelta(), scroll_amount_ + scroll_amount_);
 
       EXPECT_VECTOR_EQ(root->scroll_offset(), initial_scroll_);
       PostSetNeedsCommitToMainThread();
     } else if (impl->active_tree()->source_frame_number() == 1) {
       // Third or later draw after second commit.
       EXPECT_GE(impl->SourceAnimationFrameNumber(), 3);
       EXPECT_VECTOR_EQ(root->ScrollDelta(), gfx::Vector2d());
-      EXPECT_VECTOR_EQ(
-          root->scroll_offset(),
-          initial_scroll_ + scroll_amount_ + scroll_amount_);
+      EXPECT_VECTOR_EQ(root->scroll_offset(),
+                       initial_scroll_ + scroll_amount_ + scroll_amount_);
       EndTest();
     }
   }
 
-  virtual void ApplyScrollAndScale(
-      gfx::Vector2d scroll_delta, float scale) OVERRIDE {
+  virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta, float scale)
+      OVERRIDE {
     gfx::Vector2d offset = layer_tree_host()->root_layer()->scroll_offset();
     layer_tree_host()->root_layer()->SetScrollOffset(offset + scroll_delta);
     num_scrolls_++;
   }
 
-  virtual void AfterTest() OVERRIDE {
-    EXPECT_EQ(1, num_scrolls_);
-  }
+  virtual void AfterTest() OVERRIDE { EXPECT_EQ(1, num_scrolls_); }
+
  private:
   gfx::Vector2d initial_scroll_;
   gfx::Vector2d scroll_amount_;
   int num_scrolls_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestScrollMultipleRedraw);
 
 class LayerTreeHostScrollTestFractionalScroll : public LayerTreeHostScrollTest {
  public:
-  LayerTreeHostScrollTestFractionalScroll()
-      : scroll_amount_(1.75, 0) {
-  }
+  LayerTreeHostScrollTestFractionalScroll() : scroll_amount_(1.75, 0) {}
 
   virtual void BeginTest() OVERRIDE {
     layer_tree_host()->root_layer()->SetScrollable(true);
     PostSetNeedsCommitToMainThread();
   }
 
   virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     LayerImpl* root = impl->active_tree()->root_layer();
     root->SetMaxScrollOffset(gfx::Vector2d(100, 100));
 
     // Check that a fractional scroll delta is correctly accumulated over
     // multiple commits.
     switch (impl->active_tree()->source_frame_number()) {
       case 0:
         EXPECT_VECTOR_EQ(root->scroll_offset(), gfx::Vector2d(0, 0));
         EXPECT_VECTOR_EQ(root->ScrollDelta(), gfx::Vector2d(0, 0));
         PostSetNeedsCommitToMainThread();
         break;
       case 1:
-        EXPECT_VECTOR_EQ(
-            root->scroll_offset(),
-            gfx::ToFlooredVector2d(scroll_amount_));
-        EXPECT_VECTOR_EQ(
-            root->ScrollDelta(),
-            gfx::Vector2dF(fmod(scroll_amount_.x(), 1.0f), 0.0f));
+        EXPECT_VECTOR_EQ(root->scroll_offset(),
+                         gfx::ToFlooredVector2d(scroll_amount_));
+        EXPECT_VECTOR_EQ(root->ScrollDelta(),
+                         gfx::Vector2dF(fmod(scroll_amount_.x(), 1.0f), 0.0f));
         PostSetNeedsCommitToMainThread();
         break;
       case 2:
         EXPECT_VECTOR_EQ(
             root->scroll_offset(),
             gfx::ToFlooredVector2d(scroll_amount_ + scroll_amount_));
         EXPECT_VECTOR_EQ(
             root->ScrollDelta(),
             gfx::Vector2dF(fmod(2.0f * scroll_amount_.x(), 1.0f), 0.0f));
         EndTest();
         break;
     }
     root->ScrollBy(scroll_amount_);
   }
 
-  virtual void ApplyScrollAndScale(
-      gfx::Vector2d scroll_delta, float scale) OVERRIDE {
+  virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta, float scale)
+      OVERRIDE {
     gfx::Vector2d offset = layer_tree_host()->root_layer()->scroll_offset();
     layer_tree_host()->root_layer()->SetScrollOffset(offset + scroll_delta);
   }
 
   virtual void AfterTest() OVERRIDE {}
 
  private:
   gfx::Vector2dF scroll_amount_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestFractionalScroll);
 
 class LayerTreeHostScrollTestCaseWithChild
     : public LayerTreeHostScrollTest,
       public WebKit::WebLayerScrollClient {
  public:
   LayerTreeHostScrollTestCaseWithChild()
       : initial_offset_(10, 20),
         javascript_scroll_(40, 5),
         scroll_amount_(2, -1),
-        num_scrolls_(0) {
-  }
+        num_scrolls_(0) {}
 
   virtual void SetupTree() OVERRIDE {
     layer_tree_host()->SetDeviceScaleFactor(device_scale_factor_);
 
     scoped_refptr<Layer> root_layer = Layer::Create();
     root_layer->SetBounds(gfx::Size(10, 10));
 
     root_scroll_layer_ = ContentLayer::Create(&fake_content_layer_client_);
     root_scroll_layer_->SetBounds(gfx::Size(110, 110));
 
@@ skipping 27 matching lines @@
       expected_scroll_layer_ = root_scroll_layer_;
       expected_no_scroll_layer_ = child_layer_;
     }
 
     expected_scroll_layer_->SetScrollOffset(initial_offset_);
 
     layer_tree_host()->SetRootLayer(root_layer);
     LayerTreeHostScrollTest::SetupTree();
   }
 
-  virtual void BeginTest() OVERRIDE {
-    PostSetNeedsCommitToMainThread();
-  }
+  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
 
   virtual void didScroll() OVERRIDE {
     final_scroll_offset_ = expected_scroll_layer_->scroll_offset();
   }
 
-  virtual void ApplyScrollAndScale(
-      gfx::Vector2d scroll_delta, float scale) OVERRIDE {
+  virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta, float scale)
+      OVERRIDE {
     gfx::Vector2d offset = root_scroll_layer_->scroll_offset();
     root_scroll_layer_->SetScrollOffset(offset + scroll_delta);
     num_scrolls_++;
   }
 
   virtual void Layout() OVERRIDE {
-    EXPECT_VECTOR_EQ(
-        gfx::Vector2d(), expected_no_scroll_layer_->scroll_offset());
+    EXPECT_VECTOR_EQ(gfx::Vector2d(),
+                     expected_no_scroll_layer_->scroll_offset());
 
     switch (layer_tree_host()->commit_number()) {
       case 0:
-        EXPECT_VECTOR_EQ(
-            initial_offset_,
-            expected_scroll_layer_->scroll_offset());
+        EXPECT_VECTOR_EQ(initial_offset_,
+                         expected_scroll_layer_->scroll_offset());
         break;
       case 1:
-        EXPECT_VECTOR_EQ(
-            initial_offset_ + scroll_amount_,
-            expected_scroll_layer_->scroll_offset());
+        EXPECT_VECTOR_EQ(initial_offset_ + scroll_amount_,
+                         expected_scroll_layer_->scroll_offset());
 
         // Pretend like Javascript updated the scroll position itself.
         expected_scroll_layer_->SetScrollOffset(javascript_scroll_);
         break;
       case 2:
-        EXPECT_VECTOR_EQ(
-            javascript_scroll_ + scroll_amount_,
-            expected_scroll_layer_->scroll_offset());
+        EXPECT_VECTOR_EQ(javascript_scroll_ + scroll_amount_,
+                         expected_scroll_layer_->scroll_offset());
         break;
     }
   }
 
   virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     LayerImpl* root_impl = impl->active_tree()->root_layer();
     LayerImpl* root_scroll_layer_impl = root_impl->children()[0];
     LayerImpl* child_layer_impl = root_scroll_layer_impl->children()[0];
 
     LayerImpl* expected_scroll_layer_impl = NULL;
     LayerImpl* expected_no_scroll_layer_impl = NULL;
     if (scroll_child_layer_) {
       expected_scroll_layer_impl = child_layer_impl;
       expected_no_scroll_layer_impl = root_scroll_layer_impl;
     } else {
       expected_scroll_layer_impl = root_scroll_layer_impl;
       expected_no_scroll_layer_impl = child_layer_impl;
     }
 
     EXPECT_VECTOR_EQ(gfx::Vector2d(), root_impl->ScrollDelta());
-    EXPECT_VECTOR_EQ(
-        gfx::Vector2d(),
-        expected_no_scroll_layer_impl->ScrollDelta());
+    EXPECT_VECTOR_EQ(gfx::Vector2d(),
+                     expected_no_scroll_layer_impl->ScrollDelta());
 
     // Ensure device scale factor is affecting the layers.
     gfx::Size expected_content_bounds = gfx::ToCeiledSize(
         gfx::ScaleSize(root_scroll_layer_impl->bounds(), device_scale_factor_));
-    EXPECT_SIZE_EQ(
-        expected_content_bounds,
-        root_scroll_layer_->content_bounds());
+    EXPECT_SIZE_EQ(expected_content_bounds,
+                   root_scroll_layer_->content_bounds());
 
     expected_content_bounds = gfx::ToCeiledSize(
         gfx::ScaleSize(child_layer_impl->bounds(), device_scale_factor_));
     EXPECT_SIZE_EQ(expected_content_bounds, child_layer_->content_bounds());
 
     switch (impl->active_tree()->source_frame_number()) {
       case 0: {
         // Gesture scroll on impl thread.
         InputHandler::ScrollStatus status = impl->ScrollBegin(
-            gfx::ToCeiledPoint(
-                expected_scroll_layer_impl->position() +
-                gfx::Vector2dF(0.5f, 0.5f)),
+            gfx::ToCeiledPoint(expected_scroll_layer_impl->position() +
+                               gfx::Vector2dF(0.5f, 0.5f)),
             InputHandler::Gesture);
         EXPECT_EQ(InputHandler::ScrollStarted, status);
         impl->ScrollBy(gfx::Point(), scroll_amount_);
         impl->ScrollEnd();
 
         // Check the scroll is applied as a delta.
-        EXPECT_VECTOR_EQ(
-            initial_offset_,
-            expected_scroll_layer_impl->scroll_offset());
-        EXPECT_VECTOR_EQ(
-            scroll_amount_,
-            expected_scroll_layer_impl->ScrollDelta());
+        EXPECT_VECTOR_EQ(initial_offset_,
+                         expected_scroll_layer_impl->scroll_offset());
+        EXPECT_VECTOR_EQ(scroll_amount_,
+                         expected_scroll_layer_impl->ScrollDelta());
         break;
       }
       case 1: {
         // Wheel scroll on impl thread.
         InputHandler::ScrollStatus status = impl->ScrollBegin(
-            gfx::ToCeiledPoint(
-                expected_scroll_layer_impl->position() +
-                gfx::Vector2dF(0.5f, 0.5f)),
+            gfx::ToCeiledPoint(expected_scroll_layer_impl->position() +
+                               gfx::Vector2dF(0.5f, 0.5f)),
             InputHandler::Wheel);
         EXPECT_EQ(InputHandler::ScrollStarted, status);
         impl->ScrollBy(gfx::Point(), scroll_amount_);
         impl->ScrollEnd();
 
         // Check the scroll is applied as a delta.
-        EXPECT_VECTOR_EQ(
-            javascript_scroll_,
-            expected_scroll_layer_impl->scroll_offset());
-        EXPECT_VECTOR_EQ(
-            scroll_amount_,
-            expected_scroll_layer_impl->ScrollDelta());
+        EXPECT_VECTOR_EQ(javascript_scroll_,
+                         expected_scroll_layer_impl->scroll_offset());
+        EXPECT_VECTOR_EQ(scroll_amount_,
+                         expected_scroll_layer_impl->ScrollDelta());
         break;
       }
       case 2:
 
-        EXPECT_VECTOR_EQ(
-            javascript_scroll_ + scroll_amount_,
-            expected_scroll_layer_impl->scroll_offset());
-        EXPECT_VECTOR_EQ(
-            gfx::Vector2d(),
-            expected_scroll_layer_impl->ScrollDelta());
+        EXPECT_VECTOR_EQ(javascript_scroll_ + scroll_amount_,
+                         expected_scroll_layer_impl->scroll_offset());
+        EXPECT_VECTOR_EQ(gfx::Vector2d(),
+                         expected_scroll_layer_impl->ScrollDelta());
 
         EndTest();
         break;
     }
   }
 
   virtual void AfterTest() OVERRIDE {
     if (scroll_child_layer_) {
       EXPECT_EQ(0, num_scrolls_);
-      EXPECT_VECTOR_EQ(
-          javascript_scroll_ + scroll_amount_,
-          final_scroll_offset_);
+      EXPECT_VECTOR_EQ(javascript_scroll_ + scroll_amount_,
+                       final_scroll_offset_);
     } else {
       EXPECT_EQ(2, num_scrolls_);
       EXPECT_VECTOR_EQ(gfx::Vector2d(), final_scroll_offset_);
     }
   }
 
  protected:
   float device_scale_factor_;
   bool scroll_child_layer_;
 
@@ skipping 64 matching lines @@
 };
 
 class ImplSidePaintingScrollTestSimple : public ImplSidePaintingScrollTest {
  public:
   ImplSidePaintingScrollTestSimple()
       : initial_scroll_(10, 20),
         main_thread_scroll_(40, 5),
         impl_thread_scroll1_(2, -1),
         impl_thread_scroll2_(-3, 10),
         num_scrolls_(0),
-        can_activate_(true) {
-  }
+        can_activate_(true) {}
 
   virtual void BeginTest() OVERRIDE {
     layer_tree_host()->root_layer()->SetScrollable(true);
     layer_tree_host()->root_layer()->SetScrollOffset(initial_scroll_);
     PostSetNeedsCommitToMainThread();
   }
 
   virtual void Layout() OVERRIDE {
     Layer* root = layer_tree_host()->root_layer();
     if (!layer_tree_host()->commit_number()) {
       EXPECT_VECTOR_EQ(root->scroll_offset(), initial_scroll_);
     } else {
       EXPECT_VECTOR_EQ(root->scroll_offset(),
                        initial_scroll_ + impl_thread_scroll1_);
 
       // Pretend like Javascript updated the scroll position itself with a
       // change of main_thread_scroll.
-      root->SetScrollOffset(initial_scroll_ +
-                            main_thread_scroll_ +
+      root->SetScrollOffset(initial_scroll_ + main_thread_scroll_ +
                             impl_thread_scroll1_);
     }
   }
 
-  virtual bool CanActivatePendingTree() OVERRIDE {
-    return can_activate_;
-  }
+  virtual bool CanActivatePendingTree() OVERRIDE { return can_activate_; }
 
   virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     // We force a second draw here of the first commit before activating
     // the second commit.
     if (impl->active_tree()->source_frame_number() == 0)
       impl->SetNeedsRedraw();
   }
 
   virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     ImplSidePaintingScrollTest::DrawLayersOnThread(impl);
@@ skipping 20 matching lines @@
           // CommitCompleteOnThread will trigger this function again
           // and cause us to take the else clause.
         } else {
           can_activate_ = true;
           ASSERT_TRUE(pending_root);
           EXPECT_EQ(impl->pending_tree()->source_frame_number(), 1);
 
           root->ScrollBy(impl_thread_scroll2_);
           EXPECT_VECTOR_EQ(root->scroll_offset(), initial_scroll_);
           EXPECT_VECTOR_EQ(root->ScrollDelta(),
-              impl_thread_scroll1_ + impl_thread_scroll2_);
+                           impl_thread_scroll1_ + impl_thread_scroll2_);
           EXPECT_VECTOR_EQ(root->sent_scroll_delta(), impl_thread_scroll1_);
 
-          EXPECT_VECTOR_EQ(pending_root->scroll_offset(),
+          EXPECT_VECTOR_EQ(
+              pending_root->scroll_offset(),
               initial_scroll_ + main_thread_scroll_ + impl_thread_scroll1_);
           EXPECT_VECTOR_EQ(pending_root->ScrollDelta(), impl_thread_scroll2_);
           EXPECT_VECTOR_EQ(pending_root->sent_scroll_delta(), gfx::Vector2d());
         }
         break;
       case 1:
         EXPECT_FALSE(impl->pending_tree());
-        EXPECT_VECTOR_EQ(root->scroll_offset(),
+        EXPECT_VECTOR_EQ(
+            root->scroll_offset(),
             initial_scroll_ + main_thread_scroll_ + impl_thread_scroll1_);
         EXPECT_VECTOR_EQ(root->ScrollDelta(), impl_thread_scroll2_);
         EXPECT_VECTOR_EQ(root->sent_scroll_delta(), gfx::Vector2d());
         EndTest();
         break;
     }
   }
 
-  virtual void ApplyScrollAndScale(
-      gfx::Vector2d scroll_delta, float scale) OVERRIDE {
+  virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta, float scale)
+      OVERRIDE {
     gfx::Vector2d offset = layer_tree_host()->root_layer()->scroll_offset();
     layer_tree_host()->root_layer()->SetScrollOffset(offset + scroll_delta);
     num_scrolls_++;
   }
 
-  virtual void AfterTest() OVERRIDE {
-    EXPECT_EQ(1, num_scrolls_);
-  }
+  virtual void AfterTest() OVERRIDE { EXPECT_EQ(1, num_scrolls_); }
 
  private:
   gfx::Vector2d initial_scroll_;
   gfx::Vector2d main_thread_scroll_;
   gfx::Vector2d impl_thread_scroll1_;
   gfx::Vector2d impl_thread_scroll2_;
   int num_scrolls_;
   bool can_activate_;
 };
 
 MULTI_THREAD_TEST_F(ImplSidePaintingScrollTestSimple);
 
 class LayerTreeHostScrollTestScrollZeroMaxScrollOffset
     : public LayerTreeHostScrollTest {
  public:
   LayerTreeHostScrollTestScrollZeroMaxScrollOffset() {}
 
-  virtual void BeginTest() OVERRIDE {
-    PostSetNeedsCommitToMainThread();
-  }
+  virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
 
   virtual void DrawLayersOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     LayerImpl* root = impl->active_tree()->root_layer();
     root->SetScrollable(true);
 
     root->SetMaxScrollOffset(gfx::Vector2d(100, 100));
-    EXPECT_EQ(
-        InputHandler::ScrollStarted,
-        root->TryScroll(
-            gfx::PointF(0.0f, 1.0f),
-            InputHandler::Gesture));
+    EXPECT_EQ(InputHandler::ScrollStarted,
+              root->TryScroll(gfx::PointF(0.0f, 1.0f), InputHandler::Gesture));
 
     root->SetMaxScrollOffset(gfx::Vector2d(0, 0));
-    EXPECT_EQ(
-        InputHandler::ScrollIgnored,
-        root->TryScroll(
-            gfx::PointF(0.0f, 1.0f),
-            InputHandler::Gesture));
+    EXPECT_EQ(InputHandler::ScrollIgnored,
+              root->TryScroll(gfx::PointF(0.0f, 1.0f), InputHandler::Gesture));
 
     root->SetMaxScrollOffset(gfx::Vector2d(-100, -100));
-    EXPECT_EQ(
-        InputHandler::ScrollIgnored,
-        root->TryScroll(
-            gfx::PointF(0.0f, 1.0f),
-            InputHandler::Gesture));
+    EXPECT_EQ(InputHandler::ScrollIgnored,
+              root->TryScroll(gfx::PointF(0.0f, 1.0f), InputHandler::Gesture));
 
     EndTest();
   }
 
   virtual void AfterTest() OVERRIDE {}
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(
     LayerTreeHostScrollTestScrollZeroMaxScrollOffset);
 
 class ThreadCheckingInputHandlerClient : public InputHandlerClient {
  public:
   ThreadCheckingInputHandlerClient(base::SingleThreadTaskRunner* runner,
                                    bool* received_stop_flinging)
-      : task_runner_(runner) ,
-        received_stop_flinging_(received_stop_flinging) {}
-
-  virtual void BindToHandler(InputHandler* handler) OVERRIDE {
-    if (!task_runner_->BelongsToCurrentThread())
-      ADD_FAILURE() << "BindToClient called on wrong thread";
-  }
+      : task_runner_(runner), received_stop_flinging_(received_stop_flinging) {}
 
   virtual void Animate(base::TimeTicks time) OVERRIDE {
     if (!task_runner_->BelongsToCurrentThread())
       ADD_FAILURE() << "Animate called on wrong thread";
   }
 
   virtual void MainThreadHasStoppedFlinging() OVERRIDE {
     if (!task_runner_->BelongsToCurrentThread())
       ADD_FAILURE() << "MainThreadHasStoppedFlinging called on wrong thread";
     *received_stop_flinging_ = true;
   }
 
  private:
   base::SingleThreadTaskRunner* task_runner_;
   bool* received_stop_flinging_;
 };
 
-class ThreadCheckingFakeLayerTreeHostClient : public FakeLayerTreeHostClient {
- public:
-  ThreadCheckingFakeLayerTreeHostClient(
-      base::SingleThreadTaskRunner* task_runner,
-      bool* received_stop_flinging)
-      : FakeLayerTreeHostClient(DIRECT_3D) ,
-        task_runner_(task_runner),
-        received_stop_flinging_(received_stop_flinging) {}
-
-  virtual scoped_ptr<InputHandlerClient> CreateInputHandlerClient() OVERRIDE {
-    return scoped_ptr<InputHandlerClient>(new ThreadCheckingInputHandlerClient(
-          task_runner_, received_stop_flinging_)).Pass();
-  }
-
- private:
-  base::SingleThreadTaskRunner* task_runner_;
-  bool* received_stop_flinging_;
-};
+void BindInputHandlerOnCompositorThread(
+    const base::WeakPtr<InputHandler>& input_handler,
+    scoped_ptr<ThreadCheckingInputHandlerClient> client) {
+  input_handler->BindToClient(client.release());
+}
 
 TEST(LayerTreeHostFlingTest, DidStopFlingingThread) {
   base::Thread impl_thread("cc");
   impl_thread.Start();
-  scoped_ptr<cc::Thread> impl_ccthread =
-      cc::ThreadImpl::CreateForDifferentThread(
-          impl_thread.message_loop_proxy());
+  scoped_ptr<Thread> impl_ccthread =
+      ThreadImpl::CreateForDifferentThread(impl_thread.message_loop_proxy());
 
   bool received_stop_flinging = false;
-  ThreadCheckingFakeLayerTreeHostClient client(
-      impl_thread.message_loop_proxy().get(),
-      &received_stop_flinging);
   LayerTreeSettings settings;
 
+  scoped_ptr<ThreadCheckingInputHandlerClient> input_handler_client(
+      new ThreadCheckingInputHandlerClient(
+          impl_thread.message_loop_proxy().get(), &received_stop_flinging));
+  FakeLayerTreeHostClient client(FakeLayerTreeHostClient::DIRECT_3D);
+
   scoped_ptr<LayerTreeHost> layer_tree_host =
       LayerTreeHost::Create(&client, settings, impl_ccthread.Pass());
 
+  impl_thread.message_loop_proxy()
+      ->PostTask(FROM_HERE,
+                 base::Bind(&BindInputHandlerOnCompositorThread,
+                            layer_tree_host->GetInputHandler(),
+                            base::Passed(input_handler_client.Pass())));

[danakj, 2013/05/06 16:33:39]

nit: base::Passed(&input_handler_client)

+
   layer_tree_host->DidStopFlinging();
   layer_tree_host.reset();
   impl_thread.Stop();
   EXPECT_TRUE(received_stop_flinging);
 }
 
 }  // namespace
 }  // namespace cc