Allow binding multiple textures to one DC Layer overlay.

gpu/command_buffer/client/gles2_implementation_autogen.h

 // Copyright 2014 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.
 
 // This file is auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 1052 matching lines @@
 void FlushDriverCachesCHROMIUM() override;
 
 GLuint GetLastFlushIdCHROMIUM() override;
 
 void ScheduleDCLayerSharedStateCHROMIUM(GLfloat opacity,
                                         GLboolean is_clipped,
                                         const GLfloat* clip_rect,
                                         GLint z_order,
                                         const GLfloat* transform) override;
 
-void ScheduleDCLayerCHROMIUM(GLuint contents_texture_id,
-                             const GLfloat* contents_rect,
+void SetDCLayerTextureCHROMIUM(GLuint index,
+                               GLuint contents_texture_id) override;
+
+void ScheduleDCLayerCHROMIUM(const GLfloat* contents_rect,
                              GLuint background_color,
                              GLuint edge_aa_mask,
                              const GLfloat* bounds_rect,
                              GLuint filter) override;
 
 void MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) override;
 
 void MatrixLoadIdentityCHROMIUM(GLenum matrixMode) override;
 
 GLuint GenPathsCHROMIUM(GLsizei range) override;
@@ skipping 140 matching lines @@
 void SwapBuffersWithBoundsCHROMIUM(GLsizei count, const GLint* rects) override;
 
 void SetDrawRectangleCHROMIUM(GLint x,
                               GLint y,
                               GLint width,
                               GLint height) override;
 
 void SetEnableDCLayersCHROMIUM(GLboolean enabled) override;
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_AUTOGEN_H_