cc: Make OutputSurface::Reshape abstract

cc/output/direct_renderer.cc

Index: cc/output/direct_renderer.cc
diff --git a/cc/output/direct_renderer.cc b/cc/output/direct_renderer.cc
index 4eb13ec146f8e7817045366787d14c29bfc8e421..cc7fd12c67002cf9dd367ff183eebf9d9792a2d6 100644
--- a/cc/output/direct_renderer.cc
+++ b/cc/output/direct_renderer.cc
@@ -233,14 +233,24 @@ void DirectRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
   frame.root_damage_rect.Union(overlay_processor_->GetAndResetOverlayDamage());
   frame.root_damage_rect.Intersect(gfx::Rect(device_viewport_size));
   frame.device_viewport_size = device_viewport_size;
+  frame.device_color_space = device_color_space;
 
   // Only reshape when we know we are going to draw. Otherwise, the reshape
   // can leave the window at the wrong size if we never draw and the proper
   // viewport size is never set.
-  output_surface_->Reshape(device_viewport_size, device_scale_factor,
-                           device_color_space,
-                           frame.root_render_pass->has_transparent_background);
-  surface_size_for_swap_buffers_ = device_viewport_size;
+  bool frame_has_alpha = frame.root_render_pass->has_transparent_background;
+  if (device_viewport_size != reshape_surface_size_ ||
+      device_scale_factor != reshape_device_scale_factor_ ||
+      device_color_space != reshape_device_color_space_ ||
+      frame_has_alpha != reshape_has_alpha_) {
+    reshape_surface_size_ = device_viewport_size;
+    reshape_device_scale_factor_ = device_scale_factor;
+    reshape_device_color_space_ = device_color_space;
+    reshape_has_alpha_ = frame.root_render_pass->has_transparent_background;
+    output_surface_->Reshape(reshape_surface_size_,
+                             reshape_device_scale_factor_,
+                             reshape_device_color_space_, reshape_has_alpha_);
+  }
 
   BeginDrawingFrame(&frame);
 
@@ -542,10 +552,9 @@ bool DirectRenderer::UseRenderPass(DrawingFrame* frame,
   size.Enlarge(enlarge_pass_texture_amount_.width(),
                enlarge_pass_texture_amount_.height());
   if (!texture->id()) {
-    texture->Allocate(size,
-                      ResourceProvider::TEXTURE_HINT_IMMUTABLE_FRAMEBUFFER,
-                      resource_provider_->best_texture_format(),
-                      output_surface_->device_color_space());
+    texture->Allocate(
+        size, ResourceProvider::TEXTURE_HINT_IMMUTABLE_FRAMEBUFFER,
+        resource_provider_->best_texture_format(), frame->device_color_space);
   }
   DCHECK(texture->id());