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

content/renderer/gpu/mailbox_output_surface.cc

Index: content/renderer/gpu/mailbox_output_surface.cc
diff --git a/content/renderer/gpu/mailbox_output_surface.cc b/content/renderer/gpu/mailbox_output_surface.cc
index 936f46676be92a960fc678791b06758b0f20b489..2324fe8b4d4a181e185804548269619e98a43beb 100644
--- a/content/renderer/gpu/mailbox_output_surface.cc
+++ b/content/renderer/gpu/mailbox_output_surface.cc
@@ -113,7 +113,7 @@ void MailboxOutputSurface::DiscardBackbuffer() {
   }
 }
 
-void MailboxOutputSurface::Reshape(gfx::Size size) {
+void MailboxOutputSurface::Reshape(gfx::Size size, float scale_factor) {
   if (size == size_)
     return;