Fixes for re-enabling more MSVC level 4 warnings: gpu/ edition

gpu/command_buffer/service/texture_manager_unittest.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.
 
 #include "gpu/command_buffer/service/texture_manager.h"
 
 #include <utility>
 
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/service/error_state_mock.h"
@@ skipping 1044 matching lines @@
                          GL_TEXTURE_2D,
                          1,
                          GL_RGBA,
                          4,
                          5,
                          1,
                          0,
                          GL_RGBA,
                          GL_UNSIGNED_BYTE,
                          true);
-  GLenum type = -1;
-  GLenum format = -1;
+  GLenum type = 0;
+  GLenum format = 0;
   Texture* texture = texture_ref_->texture();
   EXPECT_FALSE(texture->GetLevelType(GL_TEXTURE_2D, -1, &type, &format));
   EXPECT_FALSE(texture->GetLevelType(GL_TEXTURE_2D, 1000, &type, &format));
   EXPECT_FALSE(texture->GetLevelType(GL_TEXTURE_2D, 0, &type, &format));
   EXPECT_TRUE(texture->GetLevelType(GL_TEXTURE_2D, 1, &type, &format));
   EXPECT_EQ(static_cast<GLenum>(GL_UNSIGNED_BYTE), type);
   EXPECT_EQ(static_cast<GLenum>(GL_RGBA), format);
   manager_->RemoveTexture(kClient1Id);
   EXPECT_TRUE(texture->GetLevelType(GL_TEXTURE_2D, 1, &type, &format));
   EXPECT_EQ(static_cast<GLenum>(GL_UNSIGNED_BYTE), type);
@@ skipping 1431 matching lines @@
 
   EXPECT_CALL(*gl_, DeleteTextures(1, _))
       .Times(1)
       .RetiresOnSaturation();
   texture_manager1_->RemoveTexture(10);
   texture_manager2_->RemoveTexture(20);
 }
 
 }  // namespace gles2
 }  // namespace gpu