Identify the active GPU using GL strings in multiple GPU situation.

gpu/config/gpu_control_list_entry_unittest.cc

 // Copyright (c) 2013 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 "base/json/json_reader.h"
 #include "gpu/config/gpu_control_list.h"
 #include "gpu/config/gpu_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #define LONG_STRING_CONST(...) #__VA_ARGS__
@@ skipping 1130 matching lines @@
         "os": {
           "type": "macosx"
         },
         "vendor_id": "0x8086",
         "device_id": ["0x0166"],
         "features": [
           "test_feature_0"
         ]
       }
   );
-  // Default is primary.
-  EntryShouldNotApply(json_default);
+  // Default is active, and the secondary Intel GPU is active.
+  EntryShouldApply(json_default);
 }
 
 TEST_F(GpuControlListEntryDualGPUTest, ActiveSecondaryGPU) {
   const std::string json = LONG_STRING_CONST(
       {
         "id": 1,
         "os": {
           "type": "macosx"
         },
         "vendor_id": "0x8086",
@@ skipping 102 matching lines @@
   EXPECT_TRUE(entry->Contains(GpuControlList::kOsLinux,
                               "3.13.0-63-generic",
                               gpu_info));
   EXPECT_FALSE(entry->Contains(GpuControlList::kOsLinux,
                                "3.19.2-1-generic",
                                gpu_info));
 }
 
 }  // namespace gpu