cc: Move LayerRasterTileIterator to a separate file and make it a queue

cc/layers/picture_layer_impl_perftest.cc

Index: cc/layers/picture_layer_impl_perftest.cc
diff --git a/cc/layers/picture_layer_impl_perftest.cc b/cc/layers/picture_layer_impl_perftest.cc
index bfb5703fc59883bdac814d401981dcb680ae4581..074467f05138e8fa7a3d5ff91dd0786b1dbde1ba 100644
--- a/cc/layers/picture_layer_impl_perftest.cc
+++ b/cc/layers/picture_layer_impl_perftest.cc
@@ -67,21 +67,21 @@ class PictureLayerImplPerfTest : public testing::Test {
     pending_layer_->DoPostCommitInitializationIfNeeded();
   }
 
-  void RunRasterIteratorConstructAndIterateTest(
-      const std::string& test_name,
-      int num_tiles,
-      const gfx::Size& viewport_size) {
+  void RunRasterQueueConstructAndIterateTest(const std::string& test_name,
+                                             int num_tiles,
+                                             const gfx::Size& viewport_size) {
     host_impl_.SetViewportSize(viewport_size);
     host_impl_.pending_tree()->UpdateDrawProperties();
 
     timer_.Reset();
     do {
       int count = num_tiles;
-      PictureLayerImpl::LayerRasterTileIterator it(pending_layer_, false);
+      scoped_ptr<TilingSetRasterQueue> queue =
+          pending_layer_->CreateRasterQueue(false);
       while (count--) {
-        ASSERT_TRUE(it) << "count: " << count;
-        ASSERT_TRUE(*it != nullptr) << "count: " << count;
-        ++it;
+        ASSERT_TRUE(!queue->IsEmpty()) << "count: " << count;
+        ASSERT_TRUE(queue->Top() != nullptr) << "count: " << count;
+        queue->Pop();
       }
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());
@@ -94,8 +94,8 @@ class PictureLayerImplPerfTest : public testing::Test {
                            true);
   }
 
-  void RunRasterIteratorConstructTest(const std::string& test_name,
-                                      const gfx::Rect& viewport) {
+  void RunRasterQueueConstructTest(const std::string& test_name,
+                                   const gfx::Rect& viewport) {
     host_impl_.SetViewportSize(viewport.size());
     pending_layer_->SetScrollOffset(
         gfx::ScrollOffset(viewport.x(), viewport.y()));
@@ -103,7 +103,8 @@ class PictureLayerImplPerfTest : public testing::Test {
 
     timer_.Reset();
     do {
-      PictureLayerImpl::LayerRasterTileIterator it(pending_layer_, false);
+      scoped_ptr<TilingSetRasterQueue> queue =
+          pending_layer_->CreateRasterQueue(false);
       timer_.NextLap();
     } while (!timer_.HasTimeLimitExpired());
 
@@ -186,6 +187,7 @@ class PictureLayerImplPerfTest : public testing::Test {
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImplPerfTest);
 };
 
+// TODO(vmpstr): Rename these tests once the perf numbers are in.
 TEST_F(PictureLayerImplPerfTest, LayerRasterTileIteratorConstructAndIterate) {
   SetupPendingTree(gfx::Size(10000, 10000), gfx::Size(256, 256));
 
@@ -197,16 +199,13 @@ TEST_F(PictureLayerImplPerfTest, LayerRasterTileIteratorConstructAndIterate) {
   pending_layer_->AddTiling(1.0f);
   pending_layer_->AddTiling(2.0f);
 
-  RunRasterIteratorConstructAndIterateTest(
-      "32_100x100", 32, gfx::Size(100, 100));
-  RunRasterIteratorConstructAndIterateTest(
-      "32_500x500", 32, gfx::Size(500, 500));
-  RunRasterIteratorConstructAndIterateTest(
-      "64_100x100", 64, gfx::Size(100, 100));
-  RunRasterIteratorConstructAndIterateTest(
-      "64_500x500", 64, gfx::Size(500, 500));
+  RunRasterQueueConstructAndIterateTest("32_100x100", 32, gfx::Size(100, 100));
+  RunRasterQueueConstructAndIterateTest("32_500x500", 32, gfx::Size(500, 500));
+  RunRasterQueueConstructAndIterateTest("64_100x100", 64, gfx::Size(100, 100));
+  RunRasterQueueConstructAndIterateTest("64_500x500", 64, gfx::Size(500, 500));
 }
 
+// TODO(vmpstr): Rename these tests once the perf numbers are in.
 TEST_F(PictureLayerImplPerfTest, LayerRasterTileIteratorConstruct) {
   SetupPendingTree(gfx::Size(10000, 10000), gfx::Size(256, 256));
 
@@ -218,11 +217,9 @@ TEST_F(PictureLayerImplPerfTest, LayerRasterTileIteratorConstruct) {
   pending_layer_->AddTiling(1.0f);
   pending_layer_->AddTiling(2.0f);
 
-  RunRasterIteratorConstructTest("0_0_100x100", gfx::Rect(0, 0, 100, 100));
-  RunRasterIteratorConstructTest("5000_0_100x100",
-                                 gfx::Rect(5000, 0, 100, 100));
-  RunRasterIteratorConstructTest("9999_0_100x100",
-                                 gfx::Rect(9999, 0, 100, 100));
+  RunRasterQueueConstructTest("0_0_100x100", gfx::Rect(0, 0, 100, 100));
+  RunRasterQueueConstructTest("5000_0_100x100", gfx::Rect(5000, 0, 100, 100));
+  RunRasterQueueConstructTest("9999_0_100x100", gfx::Rect(9999, 0, 100, 100));
 }
 
 // TODO(e_hakkinen): Rename these tests once the perf numbers are in.