gpu: Change Produce/ConsumeTexture to allow texture sharing

gpu/command_buffer/service/framebuffer_manager.cc

Index: gpu/command_buffer/service/framebuffer_manager.cc
diff --git a/gpu/command_buffer/service/framebuffer_manager.cc b/gpu/command_buffer/service/framebuffer_manager.cc
index 29fd55d89825362f00afb6e1d43d0ac265803feb..ce08830463fefe1c8e3cb6de5e1eef96323d504c 100644
--- a/gpu/command_buffer/service/framebuffer_manager.cc
+++ b/gpu/command_buffer/service/framebuffer_manager.cc
@@ -55,6 +55,10 @@ class RenderbufferAttachment
     return renderbuffer_->samples();
   }
 
+  virtual GLuint object_name() const OVERRIDE {
+    return renderbuffer_->client_id();
+  }
+
   virtual bool cleared() const OVERRIDE {
     return renderbuffer_->cleared();
   }
@@ -149,6 +153,10 @@ class TextureAttachment
     return 0;
   }
 
+  virtual GLuint object_name() const OVERRIDE {
+    return texture_ref_->client_id();
+  }
+
   virtual bool cleared() const OVERRIDE {
     return texture_ref_->texture()->IsLevelCleared(target_, level_);
   }