Reduce cost of glBind* on contexts without bind_generates_resource.

gpu/command_buffer/service/gles2_cmd_decoder_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/gles2_cmd_decoder.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
@@ skipping 5645 matching lines @@
       false,   // has alpha
       false,   // has depth
       false,   // has stencil
       false,   // request alpha
       false,   // request depth
       false,   // request stencil
       false);  // bind generates resource
 
   BindTexture cmd1;
   cmd1.Init(GL_TEXTURE_2D, kInvalidClientId);
-  EXPECT_NE(error::kNoError, ExecuteCmd(cmd1));
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd1));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
 
   BindBuffer cmd2;
   cmd2.Init(GL_ARRAY_BUFFER, kInvalidClientId);
-  EXPECT_NE(error::kNoError, ExecuteCmd(cmd2));
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd2));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
 
   BindFramebuffer cmd3;
   cmd3.Init(GL_FRAMEBUFFER, kInvalidClientId);
-  EXPECT_NE(error::kNoError, ExecuteCmd(cmd3));
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd3));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
 
   BindRenderbuffer cmd4;
   cmd4.Init(GL_RENDERBUFFER, kInvalidClientId);
-  EXPECT_NE(error::kNoError, ExecuteCmd(cmd4));
+  EXPECT_EQ(error::kNoError, ExecuteCmd(cmd4));
+  EXPECT_EQ(GL_INVALID_OPERATION, GetGLError());
 }
 
 TEST_F(GLES2DecoderManualInitTest, ARBTextureRectangleBindTexture) {
   InitDecoder(
       "GL_ARB_texture_rectangle",  // extensions
       "3.0",   // gl version
       false,   // has alpha
       false,   // has depth
       false,   // has stencil
       false,   // request alpha
@@ skipping 3240 matching lines @@
 // TODO(gman): TexImage2DImmediate
 
 // TODO(gman): TexSubImage2DImmediate
 
 // TODO(gman): UseProgram
 
 // TODO(gman): SwapBuffers
 
 }  // namespace gles2
 }  // namespace gpu