Reland of Extend CopyTextureCHROMIUM to more ES 3.0 texture formats.

gpu/command_buffer/common/gles2_cmd_utils.h

Index: gpu/command_buffer/common/gles2_cmd_utils.h
diff --git a/gpu/command_buffer/common/gles2_cmd_utils.h b/gpu/command_buffer/common/gles2_cmd_utils.h
index 1fb75aed3d5d0173e1085509b8cde935bbeb4133..8d0f16baba0fa205bdfa407f56a41ed171c6cd35 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils.h
+++ b/gpu/command_buffer/common/gles2_cmd_utils.h
@@ -140,6 +140,7 @@ class GLES2_UTILS_EXPORT GLES2Util {
   // function is called. If 0 is returned the id is invalid.
   int GLGetNumValuesReturned(int id) const;
 
+  static int ElementsPerGroup(int format, int type);
   // Computes the size of a single group of elements from a format and type pair
   static uint32_t ComputeImageGroupSize(int format, int type);