gpu: Optimize and cleanup shader code used for CHROMIUM_copy_texture.

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.h

 // Copyright (c) 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 GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_
 
+#include <vector>
+
 #include "base/containers/hash_tables.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/gpu_export.h"
 
 namespace gpu {
 namespace gles2 {
 
 class GLES2Decoder;
 
 }  // namespace gles2.
@@ skipping 23 matching lines @@
                                   GLsizei width, GLsizei height, bool flip_y,
                                   bool premultiply_alpha,
                                   bool unpremultiply_alpha,
                                   const GLfloat transform_matrix[16]);
 
   // The attributes used during invocation of the extension.
   static const GLuint kVertexPositionAttrib = 0;
 
  private:
   struct ProgramInfo {
-    ProgramInfo() : program(0u), matrix_handle(0u), sampler_locations(0u) {}
+    ProgramInfo() : program(0u), matrix_handle(0u), sampler_handle(0u) {}
 
     GLuint program;
     GLuint matrix_handle;
-    GLuint sampler_locations;
+    GLuint sampler_handle;
   };
 
   bool initialized_;
+  typedef std::vector<GLuint> ShaderVector;
+  ShaderVector vertex_shaders_;
+  ShaderVector fragment_shaders_;
   typedef std::pair<int, int> ProgramMapKey;
   typedef base::hash_map<ProgramMapKey, ProgramInfo> ProgramMap;
   ProgramMap programs_;
   GLuint buffer_id_;
   GLuint framebuffer_;
-  GLuint vertex_shader_;
 
   DISALLOW_COPY_AND_ASSIGN(CopyTextureCHROMIUMResourceManager);
 };
 
 }  // namespace gpu.
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_COPY_TEXTURE_CHROMIUM_H_