GPU: Only restore one texture unit in ScopedTextureBinder.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index d6f9fc89a47a18c7c4da25353db9f757a122e3c8..9eadd759c089db33c2c401a0f1540d1e6f4c9e55 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -581,6 +581,10 @@ class GLES2DecoderImpl : public GLES2Decoder,
       const ContextState* prev_state) const OVERRIDE {
     state_.RestoreAllTextureUnitBindings(prev_state);
   }
+  virtual void RestoreActiveTextureUnitBinding(
+      unsigned int target) const OVERRIDE {
+    state_.RestoreActiveTextureUnitBinding(target);
+  }
   virtual void RestoreAttribute(unsigned index) const OVERRIDE {
     state_.RestoreAttribute(index);
   }