Revert of Patch to remove constant attributes

include/gpu/gl/GrGLConfig.h

Index: include/gpu/gl/GrGLConfig.h
diff --git a/include/gpu/gl/GrGLConfig.h b/include/gpu/gl/GrGLConfig.h
index 4b3ab8b258424be1768a7ddede3081a9ee84894d..444be00f158d26a912f0ae4b256e7a40a07d6b4e 100644
--- a/include/gpu/gl/GrGLConfig.h
+++ b/include/gpu/gl/GrGLConfig.h
@@ -45,6 +45,12 @@
  *
  * GR_GL_CHECK_ERROR_START: controls the initial value of gCheckErrorGL
  * when GR_GL_CHECK_ERROR is 1.  Defaults to 1.
+ *
+ * GR_GL_NO_CONSTANT_ATTRIBUTES: if this evaluates to true then the GL backend
+ * will use uniforms instead of attributes in all cases when there is not
+ * per-vertex data. This is important when the underlying GL implementation
+ * doesn't actually support immediate style attribute values (e.g. when
+ * the GL stream is converted to DX as in ANGLE on Chrome). Defaults to 0.
  *
  * GR_GL_USE_BUFFER_DATA_NULL_HINT: When specifing new data for a vertex/index
  * buffer that replaces old data Ganesh can give a hint to the driver that the
@@ -120,6 +126,10 @@
     #define GR_GL_CHECK_ERROR_START                     1
 #endif
 
+#if !defined(GR_GL_NO_CONSTANT_ATTRIBUTES)
+    #define GR_GL_NO_CONSTANT_ATTRIBUTES                0
+#endif
+
 #if !defined(GR_GL_USE_BUFFER_DATA_NULL_HINT)
     #define GR_GL_USE_BUFFER_DATA_NULL_HINT             1
 #endif