Add subscribeUniform extension pipeline

BUG=422978

Committed: https://crrev.com/80b40cc8eab5e6bef6221c0bc5c1d006059acd8f
Cr-Commit-Position: refs/heads/master@{#303050}

Review URL: https://codereview.chromium.org/659903002

Cr-Commit-Position: refs/heads/master@{#303275}
diff --git a/ui/gl/gl_bindings.h b/ui/gl/gl_bindings.h
index dd737f41..aea47fc 100644
--- a/ui/gl/gl_bindings.h
+++ b/ui/gl/gl_bindings.h
@@ -143,6 +143,10 @@
 #define GL_OVERLAY_TRANSFORM_ROTATE_180_CHROMIUM         0x9249
 #define GL_OVERLAY_TRANSFORM_ROTATE_270_CHROMIUM         0x924A
 
+// GL_CHROMIUM_subscribe_uniforms
+#define GL_SUBSCRIBED_VALUES_BUFFER_CHROMIUM             0x924B
+#define GL_MOUSE_POSITION_CHROMIUM                       0x924C
+
 // GL_OES_texure_3D
 #define GL_SAMPLER_3D_OES                                0x8B5F