Adds support for the GL_ANGLE_texture_usage and GL_EXT_texture_storage

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
===================================================================
--- gpu/command_buffer/service/gles2_cmd_decoder_autogen.h	(revision 112643)
+++ gpu/command_buffer/service/gles2_cmd_decoder_autogen.h	(working copy)
@@ -2542,6 +2542,39 @@
   return error::kNoError;
 }
 
+error::Error GLES2DecoderImpl::HandleTexStorage2DEXT(
+    uint32 immediate_data_size, const gles2::TexStorage2DEXT& c) {
+  GLenum target = static_cast<GLenum>(c.target);
+  GLsizei levels = static_cast<GLsizei>(c.levels);
+  GLint internalFormat = static_cast<GLint>(c.internalFormat);
+  GLsizei width = static_cast<GLsizei>(c.width);
+  GLsizei height = static_cast<GLsizei>(c.height);
+  if (!validators_->texture_target.IsValid(target)) {
+    SetGLError(GL_INVALID_ENUM, "glTexStorage2DEXT: target GL_INVALID_ENUM");
+    return error::kNoError;
+  }
+  if (levels < 0) {
+    SetGLError(GL_INVALID_VALUE, "glTexStorage2DEXT: levels < 0");
+    return error::kNoError;
+  }
+  if (!validators_->texture_internal_format_storage.IsValid(internalFormat)) {
+    SetGLError(
+        GL_INVALID_VALUE,
+        "glTexStorage2DEXT: internalFormat GL_INVALID_VALUE");
+    return error::kNoError;
+  }
+  if (width < 0) {
+    SetGLError(GL_INVALID_VALUE, "glTexStorage2DEXT: width < 0");
+    return error::kNoError;
+  }
+  if (height < 0) {
+    SetGLError(GL_INVALID_VALUE, "glTexStorage2DEXT: height < 0");
+    return error::kNoError;
+  }
+  DoTexStorage2DEXT(target, levels, internalFormat, width, height);
+  return error::kNoError;
+}
+
 error::Error GLES2DecoderImpl::HandleGetMaxValueInBufferCHROMIUM(
     uint32 immediate_data_size, const gles2::GetMaxValueInBufferCHROMIUM& c) {
   GLuint buffer_id = c.buffer_id;