Add a "disabled" field for GPU Blacklist entries.

content/browser/gpu/gpu_data_manager.cc

 // Copyright (c) 2011 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 "content/browser/gpu/gpu_data_manager.h"
 
 #if defined(OS_MACOSX)
 #include <CoreGraphics/CGDisplayConfiguration.h>
 #endif
 
@@ skipping 404 matching lines @@
     std::vector<uint32> flag_entries;
     gpu_blacklist->GetGpuFeatureFlagEntries(
         GpuFeatureFlags::kGpuFeatureAll, flag_entries);
     DCHECK_GT(flag_entries.size(), 0u);
     for (size_t i = 0; i < flag_entries.size(); ++i) {
       UMA_HISTOGRAM_ENUMERATION("GPU.BlacklistTestResultsPerEntry",
           flag_entries[i], max_entry_id + 1);
     }
   }
 
+  // This counts how many users are affected by a disabled entry - this allows
+  // us to understand the impact of an entry before enable it.
+  std::vector<uint32> flag_disabled_entries;
+  gpu_blacklist->GetGpuFeatureFlagDisabledEntries(
+      GpuFeatureFlags::kGpuFeatureAll, flag_disabled_entries);
+  for (size_t i = 0; i < flag_disabled_entries.size(); ++i) {
+    UMA_HISTOGRAM_ENUMERATION("GPU.BlacklistTestResultsPerDisabledEntry",
+        flag_disabled_entries[i], max_entry_id + 1);
+  }
+
   const GpuFeatureFlags::GpuFeatureType kGpuFeatures[] = {
       GpuFeatureFlags::kGpuFeatureAccelerated2dCanvas,
       GpuFeatureFlags::kGpuFeatureAcceleratedCompositing,
       GpuFeatureFlags::kGpuFeatureWebgl
   };
   const std::string kGpuBlacklistFeatureHistogramNames[] = {
       "GPU.BlacklistFeatureTestResults.Accelerated2dCanvas",
       "GPU.BlacklistFeatureTestResults.AcceleratedCompositing",
       "GPU.BlacklistFeatureTestResults.Webgl"
   };
@@ skipping 30 matching lines @@
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   if (browser_command_line.HasSwitch(switches::kIgnoreGpuBlacklist) ||
       browser_command_line.GetSwitchValueASCII(
           switches::kUseGL) == gfx::kGLImplementationOSMesaName)
     return NULL;
   // No need to return an empty blacklist.
   if (gpu_blacklist_.get() != NULL && gpu_blacklist_->max_entry_id() == 0)
     return NULL;
   return gpu_blacklist_.get();
 }