Add a flag to disable partial raster in renderer

cc/tiles/tile_manager_unittest.cc

Index: cc/tiles/tile_manager_unittest.cc
diff --git a/cc/tiles/tile_manager_unittest.cc b/cc/tiles/tile_manager_unittest.cc
index e68ea1ff7794b2e8780721d3e2793db846c475af..3fc608a6106dc0ec38d0b8e8ccf79d6d1a56f239 100644
--- a/cc/tiles/tile_manager_unittest.cc
+++ b/cc/tiles/tile_manager_unittest.cc
@@ -1423,12 +1423,13 @@ TEST_F(TileManagerTilePriorityQueueTest, RasterQueueAllUsesCorrectTileBounds) {
 
 class TileManagerTest : public testing::Test {
  public:
-  TileManagerTest()
-      : output_surface_(FakeOutputSurface::CreateSoftware(
-            make_scoped_ptr(new SoftwareOutputDevice))),
-        host_impl_(new MockLayerTreeHostImpl(&proxy_,
-                                             &shared_bitmap_manager_,
-                                             &task_graph_runner_)) {
+  void SetUp() override {
+    output_surface_ = FakeOutputSurface::CreateSoftware(
+        make_scoped_ptr(new SoftwareOutputDevice));
+    LayerTreeSettings settings;
+    CustomizeSettings(&settings);
+    host_impl_.reset(new MockLayerTreeHostImpl(
+        settings, &proxy_, &shared_bitmap_manager_, &task_graph_runner_));
     host_impl_->InitializeRenderer(output_surface_.get());
   }
 
@@ -1436,14 +1437,18 @@ class TileManagerTest : public testing::Test {
   // MockLayerTreeHostImpl allows us to intercept tile manager callbacks.
   class MockLayerTreeHostImpl : public FakeLayerTreeHostImpl {
    public:
-    MockLayerTreeHostImpl(Proxy* proxy,
+    MockLayerTreeHostImpl(const LayerTreeSettings& settings,
+                          Proxy* proxy,
                           SharedBitmapManager* manager,
                           TaskGraphRunner* task_graph_runner)
-        : FakeLayerTreeHostImpl(proxy, manager, task_graph_runner) {}
+        : FakeLayerTreeHostImpl(settings, proxy, manager, task_graph_runner) {}
 
     MOCK_METHOD0(NotifyAllTileTasksCompleted, void());
   };
 
+  // By default do no customization.
+  virtual void CustomizeSettings(LayerTreeSettings* settings) {}
+
   TestSharedBitmapManager shared_bitmap_manager_;
   TestTaskGraphRunner task_graph_runner_;
   FakeImplProxy proxy_;
@@ -1601,9 +1606,16 @@ class CancellingTileTaskRunner : public TileTaskRunner, public TileTaskClient {
   ~CancellingTileTaskRunner() override {}
 };
 
+class PartialRasterTileManagerTest : public TileManagerTest {
+ public:
+  void CustomizeSettings(LayerTreeSettings* settings) override {
+    settings->enable_partial_raster = true;
+  }
+};
+
 // Ensures that if a raster task is cancelled, it gets returned to the resource
 // pool with an invalid content ID, not with its invalidated content ID.
-TEST_F(TileManagerTest, CancelledTasksHaveNoContentId) {
+TEST_F(PartialRasterTileManagerTest, CancelledTasksHaveNoContentId) {
   // Create a CancellingTaskRunner and set it on the tile manager so that all
   // scheduled work is immediately cancelled.
   CancellingTileTaskRunner cancelling_runner;