Fix VS 2015 Update 2 specific bug

gpu/command_buffer/service/gl_stream_texture_image.h

 // Copyright 2016 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 GPU_COMMAND_BUFFER_SERVICE_GL_STREAM_TEXTURE_IMAGE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GL_STREAM_TEXTURE_IMAGE_H_
 
+#include "gpu/gpu_export.h"
 #include "ui/gl/gl_image.h"
 
 namespace gpu {
 namespace gles2 {
 
 // Specialization of GLImage that allows us to support (stream) textures
 // that supply a texture matrix.
 class GPU_EXPORT GLStreamTextureImage : public gl::GLImage {
  public:
   GLStreamTextureImage() {}
 
   // Get the matrix.
   // Copy the texture matrix for this image into |matrix|.
   virtual void GetTextureMatrix(float matrix[16]) = 0;
 
  protected:
   ~GLStreamTextureImage() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLStreamTextureImage);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GL_STREAM_TEXTURE_IMAGE_H_