Add glGetShaderPrecisionFormat

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 443 matching lines @@
     }
 
     if ((kGL_GrGLStandard == fStandard &&
          (glVer >= GR_GL_VER(4,3) || fExtensions.has("GL_ARB_program_interface_query"))) ||
         (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,1))) {
         if (NULL == fFunctions.fGetProgramResourceLocation) {
             RETURN_FALSE_INTERFACE
         }
     }
 
+    if (kGLES_GrGLStandard == fStandard || glVer >= GR_GL_VER(4,1) ||
+        fExtensions.has("GL_ARB_ES2_compatibility")) {
+#if 0 // Enable this once Chrome gives us the function ptr
+        if (NULL == fFunctions.fGetShaderPrecisionFormat) {
+            RETURN_FALSE_INTERFACE
+        }
+#endif
+    }
+
     if (fExtensions.has("GL_NV_path_rendering")) {
         if (NULL == fFunctions.fPathCommands ||
             NULL == fFunctions.fPathCoords ||
             NULL == fFunctions.fPathParameteri ||
             NULL == fFunctions.fPathParameterf ||
             NULL == fFunctions.fGenPaths ||
             NULL == fFunctions.fDeletePaths ||
             NULL == fFunctions.fIsPath ||
             NULL == fFunctions.fPathStencilFunc ||
             NULL == fFunctions.fStencilFillPath ||
@@ skipping 19 matching lines @@
                 NULL == fFunctions.fStencilThenCoverStrokePathInstanced ||
                 NULL == fFunctions.fProgramPathFragmentInputGen ||
                 NULL == fFunctions.fPathMemoryGlyphIndexArray) {
                 RETURN_FALSE_INTERFACE
             }
         }
     }
 
     return true;
 }