Add calls to EnsureGPUMemoryAvailable into GLES2DecoderImpl

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 68ff41b655c3f35ab33de086cfd418f16b62359f..b215af390db1f8dee4fb3e0e7fa0c603c4ca6742 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils.h
+++ b/gpu/command_buffer/common/gles2_cmd_utils.h
@@ -109,16 +109,20 @@ class GLES2_UTILS_EXPORT GLES2Util {
 
   // Computes the size of an image row including alignment padding
   static bool ComputeImagePaddedRowSize(
-    int width, int format, int type, int unpack_alignment,
-    uint32* padded_row_size);
+      int width, int format, int type, int unpack_alignment,
+      uint32* padded_row_size);
 
   // Computes the size of image data for TexImage2D and TexSubImage2D.
   // Optionally the unpadded and padded row sizes can be returned. If height < 2
   // then the padded_row_size will be the same as the unpadded_row_size since
   // padding is not necessary.
   static bool ComputeImageDataSizes(
-    int width, int height, int format, int type, int unpack_alignment,
-    uint32* size, uint32* unpadded_row_size, uint32* padded_row_size);
+      int width, int height, int format, int type, int unpack_alignment,
+      uint32* size, uint32* unpadded_row_size, uint32* padded_row_size);
+
+  // Computes the estimated size of a renderbuffer.
+  static bool ComputeEstimatedRenderbufferSize(
+      int width, int height, int samples, int internal_format, uint32* size);
 
   static size_t RenderbufferBytesPerPixel(int format);