Update CopyTexImage2D to do internal format validation in ES3

gpu/command_buffer/common/gles2_cmd_utils.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file is here so other GLES2 related files can have a common set of
 // includes where appropriate.
 
 #ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
 #define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
 
@@ skipping 172 matching lines @@
 
   static void MapUint64ToTwoUint32(
       uint64_t v64, uint32_t* v32_0, uint32_t* v32_1);
   static uint64_t MapTwoUint32ToUint64(uint32_t v32_0, uint32_t v32_1);
 
   static uint32_t MapBufferTargetToBindingEnum(uint32_t target);
 
   static bool IsUnsignedIntegerFormat(uint32_t internal_format);
   static bool IsSignedIntegerFormat(uint32_t internal_format);
   static bool IsIntegerFormat(uint32_t internal_format);
+  static bool IsFloatFormat(uint32_t internal_format);
 
   #include "../common/gles2_cmd_utils_autogen.h"
 
  private:
   static std::string GetQualifiedEnumString(
       const EnumToString* table, size_t count, uint32_t value);
 
   static const EnumToString* const enum_to_string_table_;
   static const size_t enum_to_string_table_len_;
 
@@ skipping 28 matching lines @@
   bool fail_if_major_perf_caveat;
   bool lose_context_when_out_of_memory;
   ContextType context_type;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_