cc: Set sync token on resource even if context is lost.

cc/resources/resource_provider.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_RESOURCES_RESOURCE_PROVIDER_H_
 #define CC_RESOURCES_RESOURCE_PROVIDER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 265 matching lines @@
     unsigned texture_id() const { return texture_id_; }
     GLenum target() const { return target_; }
     ResourceFormat format() const { return format_; }
     const gfx::Size& size() const { return size_; }
     sk_sp<SkColorSpace> sk_color_space() const { return sk_color_space_; }
 
     const TextureMailbox& mailbox() const { return mailbox_; }
 
     void set_sync_token(const gpu::SyncToken& sync_token) {
       sync_token_ = sync_token;
+      set_sync_token_ = true;
     }
 
     void set_synchronized(bool synchronized) { synchronized_ = synchronized; }
 
    private:
     ResourceProvider* resource_provider_;
     ResourceId resource_id_;
     unsigned texture_id_;
     GLenum target_;
     ResourceFormat format_;
     gfx::Size size_;
     TextureMailbox mailbox_;
     gpu::SyncToken sync_token_;
+    bool set_sync_token_;
     bool synchronized_;
     base::ThreadChecker thread_checker_;
     sk_sp<SkColorSpace> sk_color_space_;
 
     DISALLOW_COPY_AND_ASSIGN(ScopedWriteLockGL);
   };
 
   class CC_EXPORT ScopedTextureProvider {
    public:
     ScopedTextureProvider(gpu::gles2::GLES2Interface* gl,
@@ skipping 407 matching lines @@
   // A process-unique ID used for disambiguating memory dumps from different
   // resource providers.
   int tracing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceProvider);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_PROVIDER_H_