RenderWidgetCompositor should be decoupled from RenderWidget.

content/renderer/gpu/render_widget_compositor_unittest.cc

Index: content/renderer/gpu/render_widget_compositor_unittest.cc
diff --git a/content/renderer/gpu/render_widget_compositor_unittest.cc b/content/renderer/gpu/render_widget_compositor_unittest.cc
index 228fc47bea3d63d9d03a39697fe19ba7423a90c4..b217639d7802b4bd59bdfedd13d4c1c2b4f0277e 100644
--- a/content/renderer/gpu/render_widget_compositor_unittest.cc
+++ b/content/renderer/gpu/render_widget_compositor_unittest.cc
@@ -62,9 +62,10 @@ class RenderWidgetCompositorTest : public testing::Test {
   RenderWidgetCompositorTest()
       : compositor_deps_(new FakeCompositorDependencies),
         render_widget_(new TestRenderWidget(compositor_deps_.get())),
-        render_widget_compositor_(
-            RenderWidgetCompositor::Create(render_widget_.get(),
-                                           compositor_deps_.get())) {}
+        render_widget_compositor_(RenderWidgetCompositor::Create(
+            render_widget_.get(),
+            1.f /* initial_device_scale_factor */,
+            compositor_deps_.get())) {}
   ~RenderWidgetCompositorTest() override {}
 
  protected:
@@ -243,7 +244,8 @@ class RenderWidgetCompositorOutputSurfaceTest : public testing::Test {
         render_widget_(new RenderWidgetOutputSurface(compositor_deps_.get())) {
     render_widget_compositor_.reset(new RenderWidgetCompositorOutputSurface(
         render_widget_.get(), compositor_deps_.get()));
-    render_widget_compositor_->Initialize();
+    render_widget_compositor_->Initialize(
+        1.f /* initial_device_scale_factor */);
     render_widget_->SetCompositor(render_widget_compositor_.get());
   }