Fix int overflow in GLES2DecoderImpl::DoDrawArrays

gpu/command_buffer/service/gles2_cmd_decoder_unittest_drawing.cc

 // Copyright 2014 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdint.h>
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 785 matching lines @@
        DrawArraysMissingAttributesZeroCountSucceeds) {
   DoEnableVertexAttribArray(1);
 
   EXPECT_CALL(*gl_, DrawArrays(_, _, _)).Times(0);
   DrawArrays cmd;
   cmd.Init(GL_TRIANGLES, 0, 0);
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_NO_ERROR, GetGLError());
 }
 
+TEST_P(GLES2DecoderWithShaderTest, DrawArraysIntOverflow) {
+  DoEnableVertexAttribArray(1);
+
+  GLint large = std::numeric_limits<GLint>::max();
+
+  EXPECT_CALL(*gl_, DrawArrays(_, _, _)).Times(0);
+  DrawArrays cmd;
+  cmd.Init(GL_TRIANGLES, large, large);
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
+}
+
 TEST_P(GLES2DecoderWithShaderTest, DrawArraysValidAttributesSucceeds) {
   SetupTexture();
   SetupVertexBuffer();
   DoEnableVertexAttribArray(1);
   DoVertexAttribPointer(1, 2, GL_FLOAT, 0, 0);
   AddExpectationsForSimulatedAttrib0(kNumVertices, kServiceBufferId);
   SetupExpectationsForApplyingDefaultDirtyState();
 
   EXPECT_CALL(*gl_, DrawArrays(GL_TRIANGLES, 0, kNumVertices))
       .Times(1)
@@ skipping 1506 matching lines @@
       .Times(1)
       .RetiresOnSaturation();
   DrawArrays cmd;
   cmd.Init(GL_TRIANGLES, 0, kNumVertices);
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_NO_ERROR, GetGLError());
 }
 
 }  // namespace gles2
 }  // namespace gpu