Add initial support for NV_path_rendering extension to gpu command buffer

gpu/GLES2/gl2extchromium.h

Index: gpu/GLES2/gl2extchromium.h
diff --git a/gpu/GLES2/gl2extchromium.h b/gpu/GLES2/gl2extchromium.h
index db4f12ff90755fe63dceeeec99a2c468092a7d9d..d2a9101374f0d7e97464678fa3ae51a2ca59f45d 100644
--- a/gpu/GLES2/gl2extchromium.h
+++ b/gpu/GLES2/gl2extchromium.h
@@ -692,6 +692,22 @@ typedef void(GL_APIENTRYP PFNGLSCHEDULEOVERLAYPLANECHROMIUMPROC)(
     GLfloat uv_height);
 #endif /* GL_CHROMIUM_schedule_overlay_plane */
 
+#ifndef GL_CHROMIUM_path_rendering
+#define GL_CHROMIUM_path_rendering 1
+
+#ifdef GL_GLEXT_PROTOTYPES
+GL_APICALL void GL_APIENTRY glMatrixLoadfCHROMIUM(GLenum mode,
+                                                  const GLfloat* m);
+GL_APICALL void GL_APIENTRY glMatrixLoadIdentityCHROMIUM(GLenum mode);
+#endif
+
+typedef void (GL_APIENTRYP PFNGLMATRIXLOADFCHROMIUMPROC) (
+    GLenum matrixMode, const GLfloat* m);
+typedef void (GL_APIENTRYP PFNGLMATRIXLOADIDENTITYCHROMIUMPROC) (
+    GLenum matrixMode);
+
+#endif /* GL_CHROMIUM_path_rendering */
+
 #ifdef __cplusplus
 }
 #endif