Add glDrawBuffer(s) to GrGLInterface

Review URL: http://codereview.appspot.com/4841046/



git-svn-id: http://skia.googlecode.com/svn/trunk@2032 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/android/GrGLDefaultInterface_android.cpp b/gpu/src/android/GrGLDefaultInterface_android.cpp
index dfb9041..b402176 100644
--- a/gpu/src/android/GrGLDefaultInterface_android.cpp
+++ b/gpu/src/android/GrGLDefaultInterface_android.cpp
@@ -52,6 +52,8 @@
     NULL,  // glDisableClientState
     glDisableVertexAttribArray,
     glDrawArrays,
+    NULL, // glDrawBuffer
+    NULL, // glDrawBuffers
     glDrawElements,
     glEnable,
     NULL,  // glEnableClientState