Use NV_draw_buffers to implement EXT_draw_buffers

gpu/command_buffer/service/test_helper.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/test_helper.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 374 matching lines @@
         .RetiresOnSaturation();
     EXPECT_CALL(*gl, BindTexture(GL_TEXTURE_2D, gl_ids[0]))
         .Times(1)
         .RetiresOnSaturation();
 #if DCHECK_IS_ON
     EXPECT_CALL(*gl, GetError())
         .WillOnce(Return(GL_NO_ERROR))
         .RetiresOnSaturation();
 #endif
   }
+
+  if (strstr(extensions, "GL_EXT_draw_buffers") ||
+      strstr(extensions, "GL_ARB_draw_buffers") ||
+      (is_es3 && strstr(extensions, "GL_NV_draw_buffers"))) {
+    EXPECT_CALL(*gl, GetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, _))
+        .WillOnce(SetArgumentPointee<1>(8))
+        .RetiresOnSaturation();
+    EXPECT_CALL(*gl, GetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, _))
+        .WillOnce(SetArgumentPointee<1>(8))
+        .RetiresOnSaturation();
+  }
 }
 
 void TestHelper::SetupExpectationsForClearingUniforms(
     ::gfx::MockGLInterface* gl, UniformInfo* uniforms, size_t num_uniforms) {
   for (size_t ii = 0; ii < num_uniforms; ++ii) {
     const UniformInfo& info = uniforms[ii];
     switch (info.type) {
     case GL_FLOAT:
       EXPECT_CALL(*gl, Uniform1fv(info.real_location, info.size, _))
           .Times(1)
@@ skipping 315 matching lines @@
   gfx::SetGLImplementation(implementation);
 }
 
 ScopedGLImplementationSetter::~ScopedGLImplementationSetter() {
   gfx::SetGLImplementation(old_implementation_);
 }
 
 }  // namespace gles2
 }  // namespace gpu