Part 1/3 (compositor) of adding with device scale factor to transport surfaces

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index b151e36b2cb0a2da8e28932471ab583a031c8fee..532d1349dc82c692277334019b87543ef33c470c 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -317,7 +317,8 @@ void GLRenderer::BeginDrawingFrame(DrawingFrame* frame) {
     // can leave the window at the wrong size if we never draw and the proper
     // viewport size is never set.
     is_viewport_changed_ = false;
-    output_surface_->Reshape(gfx::Size(ViewportWidth(), ViewportHeight()));
+    output_surface_->Reshape(gfx::Size(ViewportWidth(), ViewportHeight()),
+                             DeviceScaleFactor());
   }
 
   MakeContextCurrent();