Add calls to EnsureGPUMemoryAvailable into GLES2DecoderImpl

gpu/command_buffer/common/gles2_cmd_utils.cc

 // 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.
 
 #include <stdio.h>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
@@ skipping 427 matching lines @@
       *ret_padded_row_size = row_size;
     }
   }
   if (ret_unpadded_row_size) {
     *ret_unpadded_row_size = row_size;
   }
 
   return true;
 }
 
+bool GLES2Util::ComputeEstimatedRenderbufferSize(
+    int width, int height, int samples, int internal_format, uint32* size) {
+  uint32 temp = 0;
+  if (!SafeMultiplyUint32(width, height, &temp)) {
+    return false;
+  }
+  if (!SafeMultiplyUint32(temp, samples, &temp)) {
+    return false;
+  }
+  if (!SafeMultiplyUint32(
+      temp, GLES2Util::RenderbufferBytesPerPixel(internal_format), &temp)) {
+    return false;
+  }
+  *size = temp;
+  return true;
+}
+
 size_t GLES2Util::RenderbufferBytesPerPixel(int format) {
   switch (format) {
     case GL_STENCIL_INDEX8:
       return 1;
     case GL_RGBA4:
     case GL_RGB565:
     case GL_RGB5_A1:
     case GL_DEPTH_COMPONENT16:
       return 2;
     case GL_RGB:
@@ skipping 334 matching lines @@
   }
 
   return true;
 }
 
 #include "../common/gles2_cmd_utils_implementation_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu