gpu: Add CHROMIUM_copy_image extension.

gpu/GLES2/gl2extchromium.h

Index: gpu/GLES2/gl2extchromium.h
diff --git a/gpu/GLES2/gl2extchromium.h b/gpu/GLES2/gl2extchromium.h
index 6752ac7ae184bb9f17b49c023f91bba66b411fd9..fde74c9b4e556418952286a29e5d013652c2d351 100644
--- a/gpu/GLES2/gl2extchromium.h
+++ b/gpu/GLES2/gl2extchromium.h
@@ -1217,6 +1217,34 @@ GL_APICALL void GL_APIENTRY glCoverageModulationCHROMIUM(GLenum components);
 #define GL_COVERAGE_MODULATION_CHROMIUM 0x9332
 #endif /* GL_CHROMIUM_framebuffer_mixed_samples */
 
+/* GL_CHROMIUM_copy_image */
+#ifndef GL_CHROMIUM_copy_image
+#define GL_CHROMIUM_copy_image 1
+#ifdef GL_GLEXT_PROTOTYPES
+GL_APICALL void GL_APIENTRY glCopyImageSubDataCHROMIUM(GLint source_image_id,
+                                                       GLint dest_texture_id,
+                                                       GLint xoffset,
+                                                       GLint yoffset,
+                                                       GLint x,
+                                                       GLint y,
+                                                       GLsizei width,
+                                                       GLsizei height,
+                                                       GLint in_fence_id,
+                                                       GLint out_fence_id);
+#endif
+typedef void(GL_APIENTRYP PFNGLCOPYIMAGESUBDATACHROMIUMPROC)(
+    GLint source_image_id,
+    GLint dest_texture_id,
+    GLint xoffset,
+    GLint yoffset,
+    GLint x,
+    GLint y,
+    GLsizei width,
+    GLsizei height,
+    GLint in_fence_id,
+    GLint out_fence_id);
+#endif /* GL_CHROMIUM_copy_image */
+
 #ifdef __cplusplus
 }
 #endif