Simplify ppapi Graphics3D size propagation a bit

ppapi/shared_impl/ppb_graphics_3d_shared.h

Index: ppapi/shared_impl/ppb_graphics_3d_shared.h
diff --git a/ppapi/shared_impl/ppb_graphics_3d_shared.h b/ppapi/shared_impl/ppb_graphics_3d_shared.h
index 4c8a1ab6c7443c3c7aaeb0dccd41346a570e0abe..84bad21d19e049f1c556174f727ff3f21b932585 100644
--- a/ppapi/shared_impl/ppb_graphics_3d_shared.h
+++ b/ppapi/shared_impl/ppb_graphics_3d_shared.h
@@ -15,6 +15,7 @@
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/thunk/ppb_graphics_3d_api.h"
+#include "ui/gfx/geometry/size.h"
 
 namespace gpu {
 class CommandBuffer;
@@ -44,8 +45,7 @@ class PPAPI_SHARED_EXPORT PPB_Graphics3D_Shared
   int32_t SwapBuffers(scoped_refptr<TrackedCallback> callback) override;
   int32_t SwapBuffersWithSyncToken(scoped_refptr<TrackedCallback> callback,
                                    const gpu::SyncToken& sync_token,
-                                   int32_t width,
-                                   int32_t height) override;
+                                   const gfx::Size& size) override;
   int32_t GetAttribMaxValue(int32_t attribute, int32_t* value) override;
 
   void* MapTexSubImage2DCHROMIUM(GLenum target,
@@ -67,14 +67,14 @@ class PPAPI_SHARED_EXPORT PPB_Graphics3D_Shared
 
  protected:
   PPB_Graphics3D_Shared(PP_Instance instance);
-  PPB_Graphics3D_Shared(const HostResource& host_resource);
+  PPB_Graphics3D_Shared(const HostResource& host_resource,
+                        const gfx::Size& size);
   ~PPB_Graphics3D_Shared() override;
 
   virtual gpu::CommandBuffer* GetCommandBuffer() = 0;
   virtual gpu::GpuControl* GetGpuControl() = 0;
   virtual int32_t DoSwapBuffers(const gpu::SyncToken& sync_token,
-                                int32_t width,
-                                int32_t height) = 0;
+                                const gfx::Size& size) = 0;
 
   bool HasPendingSwap() const;
   bool CreateGLES2Impl(int32_t command_buffer_size,
@@ -87,9 +87,9 @@ class PPAPI_SHARED_EXPORT PPB_Graphics3D_Shared
   std::unique_ptr<gpu::TransferBuffer> transfer_buffer_;
   std::unique_ptr<gpu::gles2::GLES2Implementation> gles2_impl_;
 
-  // A local cache of the size of the viewport.
-  int32_t width_ = -1;
-  int32_t height_ = -1;
+  // A local cache of the size of the viewport. This is only valid in plugin
+  // resources.
+  gfx::Size size_;
 
   // Callback that needs to be executed when swap-buffers is completed.
   scoped_refptr<TrackedCallback> swap_callback_;