Refactor cc scrollbar layers to separate solid-color vs desktop.

cc/layers/scrollbar_layer_unittest.cc

Index: cc/layers/scrollbar_layer_unittest.cc
diff --git a/cc/layers/scrollbar_layer_unittest.cc b/cc/layers/scrollbar_layer_unittest.cc
index 0c160c400d9b1fdc72de719fe598db04d5c51ef0..216b8f2364b850e4082bd89a60467f072a0bf575 100644
--- a/cc/layers/scrollbar_layer_unittest.cc
+++ b/cc/layers/scrollbar_layer_unittest.cc
@@ -6,7 +6,10 @@
 
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/layers/append_quads_data.h"
+#include "cc/layers/scrollbar_layer_base.h"
 #include "cc/layers/scrollbar_layer_impl.h"
+#include "cc/layers/solid_color_scrollbar_layer.h"
+#include "cc/layers/solid_color_scrollbar_layer_impl.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/resources/prioritized_resource_manager.h"
 #include "cc/resources/priority_calculator.h"
@@ -32,12 +35,19 @@ namespace {
 LayerImpl* LayerImplForScrollAreaAndScrollbar(
     FakeLayerTreeHost* host,
     scoped_ptr<Scrollbar> scrollbar,
-    bool reverse_order) {
+    bool reverse_order,
+    bool use_solid_color_scrollbar,
+    int thumb_thickness) {
   scoped_refptr<Layer> layer_tree_root = Layer::Create();
   scoped_refptr<Layer> child1 = Layer::Create();
-  scoped_refptr<Layer> child2 =
-      ScrollbarLayer::Create(scrollbar.Pass(),
-                             child1->id());
+  scoped_refptr<Layer> child2;
+  if (use_solid_color_scrollbar) {
+    SkColor color = SkColorSetARGB(128, 128, 128, 128);
+    child2 = SolidColorScrollbarLayer::Create(
+        scrollbar->Orientation(), thumb_thickness, color, child1->id());
+  } else {
+    child2 = ScrollbarLayer::Create(scrollbar.Pass(), child1->id());
+  }
   layer_tree_root->AddChild(child1);
   layer_tree_root->InsertChild(child2, reverse_order ? 0 : 1);
   host->SetRootLayer(layer_tree_root);
@@ -47,8 +57,8 @@ LayerImpl* LayerImplForScrollAreaAndScrollbar(
 TEST(ScrollbarLayerTest, ResolveScrollLayerPointer) {
   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
-  LayerImpl* layer_impl_tree_root =
-      LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), false);
+  LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
+      host.get(), scrollbar.Pass(), false, false, 0);
 
   LayerImpl* cc_child1 = layer_impl_tree_root->children()[0];
   ScrollbarLayerImpl* cc_child2 = static_cast<ScrollbarLayerImpl*>(
@@ -60,8 +70,8 @@ TEST(ScrollbarLayerTest, ResolveScrollLayerPointer) {
 TEST(ScrollbarLayerTest, ResolveScrollLayerPointer_ReverseOrder) {
   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
-  LayerImpl* layer_impl_tree_root =
-      LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), true);
+  LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
+      host.get(), scrollbar.Pass(), true, false, 0);
 
   ScrollbarLayerImpl* cc_child1 = static_cast<ScrollbarLayerImpl*>(
       layer_impl_tree_root->children()[0]);
@@ -75,8 +85,8 @@ TEST(ScrollbarLayerTest, ShouldScrollNonOverlayOnMainThread) {
 
   // Create and attach a non-overlay scrollbar.
   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
-  LayerImpl* layer_impl_tree_root =
-      LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), false);
+  LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
+      host.get(), scrollbar.Pass(), false, false, 0);
   ScrollbarLayerImpl* scrollbar_layer_impl =
       static_cast<ScrollbarLayerImpl*>(layer_impl_tree_root->children()[1]);
 
@@ -90,8 +100,8 @@ TEST(ScrollbarLayerTest, ShouldScrollNonOverlayOnMainThread) {
   // Create and attach an overlay scrollbar.
   scrollbar.reset(new FakeScrollbar(false, false, true));
 
-  layer_impl_tree_root =
-      LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), false);
+  layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
+      host.get(), scrollbar.Pass(), false, false, 0);
   scrollbar_layer_impl =
       static_cast<ScrollbarLayerImpl*>(layer_impl_tree_root->children()[1]);
 
@@ -130,8 +140,8 @@ TEST(ScrollbarLayerTest, ScrollOffsetSynchronization) {
   ScrollbarLayerImpl* cc_scrollbar_layer =
       static_cast<ScrollbarLayerImpl*>(layer_impl_tree_root->children()[1]);
 
-  EXPECT_EQ(10.f, cc_scrollbar_layer->CurrentPos());
-  EXPECT_EQ(30, cc_scrollbar_layer->Maximum());
+  EXPECT_EQ(10.f, cc_scrollbar_layer->current_pos());
+  EXPECT_EQ(30, cc_scrollbar_layer->maximum());
 
   layer_tree_root->SetScrollOffset(gfx::Vector2d(100, 200));
   layer_tree_root->SetMaxScrollOffset(gfx::Vector2d(300, 500));
@@ -146,31 +156,31 @@ TEST(ScrollbarLayerTest, ScrollOffsetSynchronization) {
   EXPECT_EQ(scrollbar_controller,
             layer_impl_tree_root->scrollbar_animation_controller());
 
-  EXPECT_EQ(100.f, cc_scrollbar_layer->CurrentPos());
-  EXPECT_EQ(300, cc_scrollbar_layer->Maximum());
+  EXPECT_EQ(100.f, cc_scrollbar_layer->current_pos());
+  EXPECT_EQ(300, cc_scrollbar_layer->maximum());
 
   layer_impl_tree_root->ScrollBy(gfx::Vector2d(12, 34));
 
-  EXPECT_EQ(112.f, cc_scrollbar_layer->CurrentPos());
-  EXPECT_EQ(300, cc_scrollbar_layer->Maximum());
+  EXPECT_EQ(112.f, cc_scrollbar_layer->current_pos());
+  EXPECT_EQ(300, cc_scrollbar_layer->maximum());
 }
 
 TEST(ScrollbarLayerTest, SolidColorDrawQuads) {
+  const int thumb_thickness = 3;
+  const int track_length = 100;
+
   LayerTreeSettings layer_tree_settings;
-  layer_tree_settings.solid_color_scrollbars = true;
-  layer_tree_settings.solid_color_scrollbar_thickness_dip = 3;
   scoped_ptr<FakeLayerTreeHost> host =
       FakeLayerTreeHost::Create(layer_tree_settings);
 
   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, true));
-  LayerImpl* layer_impl_tree_root =
-      LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), false);
-  ScrollbarLayerImpl* scrollbar_layer_impl =
+  LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
+      host.get(), scrollbar.Pass(), false, true, thumb_thickness);
+  ScrollbarLayerImplBase* scrollbar_layer_impl =
       static_cast<ScrollbarLayerImpl*>(layer_impl_tree_root->children()[1]);
-  scrollbar_layer_impl->set_thumb_thickness(3);
-  scrollbar_layer_impl->SetCurrentPos(10.f);
-  scrollbar_layer_impl->SetMaximum(100);
-  scrollbar_layer_impl->set_track_length(100);
+  scrollbar_layer_impl->SetBounds(gfx::Size(track_length, thumb_thickness));
+  scrollbar_layer_impl->set_current_pos(10.f);
+  scrollbar_layer_impl->set_maximum(100);
   scrollbar_layer_impl->set_visible_to_total_length_ratio(0.4f);
 
   // Thickness should be overridden to 3.
@@ -217,22 +227,22 @@ TEST(ScrollbarLayerTest, SolidColorDrawQuads) {
 }
 
 TEST(ScrollbarLayerTest, LayerDrivenSolidColorDrawQuads) {
+  const int thumb_thickness = 3;
+  const int track_length = 10;
+
   LayerTreeSettings layer_tree_settings;
-  layer_tree_settings.solid_color_scrollbars = true;
-  layer_tree_settings.solid_color_scrollbar_thickness_dip = 3;
   scoped_ptr<FakeLayerTreeHost> host =
       FakeLayerTreeHost::Create(layer_tree_settings);
 
   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, true));
-  LayerImpl* layer_impl_tree_root =
-      LayerImplForScrollAreaAndScrollbar(host.get(), scrollbar.Pass(), false);
-  ScrollbarLayerImpl* scrollbar_layer_impl =
+  LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
+      host.get(), scrollbar.Pass(), false, true, thumb_thickness);
+  ScrollbarLayerImplBase* scrollbar_layer_impl =
       static_cast<ScrollbarLayerImpl*>(layer_impl_tree_root->children()[1]);
 
-  scrollbar_layer_impl->set_thumb_thickness(3);
-  scrollbar_layer_impl->set_track_length(10);
-  scrollbar_layer_impl->SetCurrentPos(4.f);
-  scrollbar_layer_impl->SetMaximum(8);
+  scrollbar_layer_impl->SetBounds(gfx::Size(track_length, thumb_thickness));
+  scrollbar_layer_impl->set_current_pos(4.f);
+  scrollbar_layer_impl->set_maximum(8);
 
   layer_impl_tree_root->SetScrollable(true);
   layer_impl_tree_root->SetHorizontalScrollbarLayer(scrollbar_layer_impl);
@@ -256,70 +266,73 @@ class ScrollbarLayerSolidColorThumbTest : public testing::Test {
  public:
   ScrollbarLayerSolidColorThumbTest() {
     LayerTreeSettings layer_tree_settings;
-    layer_tree_settings.solid_color_scrollbars = true;
     host_impl_.reset(new FakeLayerTreeHostImpl(layer_tree_settings, &proxy_));
 
-    horizontal_scrollbar_layer_ = ScrollbarLayerImpl::Create(
-        host_impl_->active_tree(), 1, HORIZONTAL);
-    vertical_scrollbar_layer_ = ScrollbarLayerImpl::Create(
-        host_impl_->active_tree(), 2, VERTICAL);
+    const int thumb_thickness = 3;
+    const SkColor color = SkColorSetARGB(128, 128, 128, 128);
+
+    horizontal_scrollbar_layer_ = SolidColorScrollbarLayerImpl::Create(
+        host_impl_->active_tree(), 1, HORIZONTAL, thumb_thickness, color);
+    vertical_scrollbar_layer_ = SolidColorScrollbarLayerImpl::Create(
+        host_impl_->active_tree(),
+        2,
+        VERTICAL,
+        thumb_thickness, color);
   }
 
  protected:
   FakeImplProxy proxy_;
   scoped_ptr<FakeLayerTreeHostImpl> host_impl_;
-  scoped_ptr<ScrollbarLayerImpl> horizontal_scrollbar_layer_;
-  scoped_ptr<ScrollbarLayerImpl> vertical_scrollbar_layer_;
+  scoped_ptr<SolidColorScrollbarLayerImpl> horizontal_scrollbar_layer_;
+  scoped_ptr<SolidColorScrollbarLayerImpl> vertical_scrollbar_layer_;
 };
 
 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbLength) {
-  horizontal_scrollbar_layer_->SetCurrentPos(0);
-  horizontal_scrollbar_layer_->SetMaximum(10);
-  horizontal_scrollbar_layer_->set_thumb_thickness(3);
+  horizontal_scrollbar_layer_->set_current_pos(0);
+  horizontal_scrollbar_layer_->set_maximum(10);
 
   // Simple case - one third of the scrollable area is visible, so the thumb
   // should be one third as long as the track.
   horizontal_scrollbar_layer_->set_visible_to_total_length_ratio(0.33f);
-  horizontal_scrollbar_layer_->set_track_length(100);
+  horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
   EXPECT_EQ(33, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 
   // The thumb's length should never be less than its thickness.
   horizontal_scrollbar_layer_->set_visible_to_total_length_ratio(0.01f);
-  horizontal_scrollbar_layer_->set_track_length(100);
+  horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
   EXPECT_EQ(3, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 }
 
 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbPosition) {
-  horizontal_scrollbar_layer_->set_track_length(100);
+  horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
   horizontal_scrollbar_layer_->set_visible_to_total_length_ratio(0.1f);
-  horizontal_scrollbar_layer_->set_thumb_thickness(3);
 
-  horizontal_scrollbar_layer_->SetCurrentPos(0);
-  horizontal_scrollbar_layer_->SetMaximum(100);
+  horizontal_scrollbar_layer_->set_current_pos(0);
+  horizontal_scrollbar_layer_->set_maximum(100);
   EXPECT_EQ(0, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
   EXPECT_EQ(10, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 
-  horizontal_scrollbar_layer_->SetCurrentPos(100);
+  horizontal_scrollbar_layer_->set_current_pos(100);
   // The thumb is 10px long and the track is 100px, so the maximum thumb
   // position is 90px.
   EXPECT_EQ(90, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 
-  horizontal_scrollbar_layer_->SetCurrentPos(80);
+  horizontal_scrollbar_layer_->set_current_pos(80);
   // The scroll position is 80% of the maximum, so the thumb's position should
   // be at 80% of its maximum or 72px.
   EXPECT_EQ(72, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 }
 
 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbVerticalAdjust) {
-  ScrollbarLayerImpl* layers[2] =
+  SolidColorScrollbarLayerImpl* layers[2] =
       { horizontal_scrollbar_layer_.get(), vertical_scrollbar_layer_.get() };
   for (size_t i = 0; i < 2; ++i) {
-    layers[i]->set_track_length(100);
     layers[i]->set_visible_to_total_length_ratio(0.2f);
-    layers[i]->set_thumb_thickness(3);
-    layers[i]->SetCurrentPos(25);
-    layers[i]->SetMaximum(100);
+    layers[i]->set_current_pos(25);
+    layers[i]->set_maximum(100);
   }
+  layers[0]->SetBounds(gfx::Size(100, 3));
+  layers[1]->SetBounds(gfx::Size(3, 100));
 
   EXPECT_RECT_EQ(gfx::RectF(20.f, 0.f, 20.f, 3.f),
                  horizontal_scrollbar_layer_->ComputeThumbQuadRect());
@@ -415,15 +428,27 @@ class ScrollbarLayerTestResourceCreation : public testing::Test {
   ScrollbarLayerTestResourceCreation()
       : fake_client_(FakeLayerTreeHostClient::DIRECT_3D) {}
 
-  void TestResourceUpload(size_t expected_resources) {
+  void TestResourceUpload(size_t expected_resources,
+                          bool use_solid_color_scrollbar) {
     layer_tree_host_.reset(
         new MockLayerTreeHost(&fake_client_, layer_tree_settings_));
 
     scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, false));
     scoped_refptr<Layer> layer_tree_root = Layer::Create();
     scoped_refptr<Layer> content_layer = Layer::Create();
-    scoped_refptr<Layer> scrollbar_layer =
-        ScrollbarLayer::Create(scrollbar.Pass(), layer_tree_root->id());
+    scoped_refptr<Layer> scrollbar_layer;
+    if (use_solid_color_scrollbar) {
+      SkColor color = SkColorSetARGB(128, 128, 128, 128);
+      int thumb_thickness = 3;
+      scrollbar_layer =
+          SolidColorScrollbarLayer::Create(scrollbar->Orientation(),
+                                           thumb_thickness,
+                                           color,
+                                           layer_tree_root->id());
+    } else {
+      scrollbar_layer =
+          ScrollbarLayer::Create(scrollbar.Pass(), layer_tree_root->id());
+    }
     layer_tree_root->AddChild(content_layer);
     layer_tree_root->AddChild(scrollbar_layer);
 
@@ -470,13 +495,11 @@ class ScrollbarLayerTestResourceCreation : public testing::Test {
 };
 
 TEST_F(ScrollbarLayerTestResourceCreation, ResourceUpload) {
-  layer_tree_settings_.solid_color_scrollbars = false;
-  TestResourceUpload(2);
+  TestResourceUpload(2, false);
 }
 
 TEST_F(ScrollbarLayerTestResourceCreation, SolidColorNoResourceUpload) {
-  layer_tree_settings_.solid_color_scrollbars = true;
-  TestResourceUpload(0);
+  TestResourceUpload(0, true);
 }
 
 class ScaledScrollbarLayerTestResourceCreation : public testing::Test {
@@ -566,7 +589,6 @@ class ScaledScrollbarLayerTestResourceCreation : public testing::Test {
 };
 
 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);