Add test for accessibility histograms.

content/browser/accessibility/browser_accessibility_state_impl.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 "content/browser/accessibility/browser_accessibility_state_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/timer.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 32 matching lines @@
     accessibility_mode_ = AccessibilityModeEditableTextOnly;
   }
 #endif  // defined(OS_WIN)
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kForceRendererAccessibility)) {
     accessibility_mode_ = AccessibilityModeComplete;
   }
 
 #if defined(OS_WIN)
-  // On Windows, UpdateHistogram calls some system functions with unknown
+  // On Windows, UpdateHistograms calls some system functions with unknown
   // runtime, so call it on the file thread to ensure there's no jank.
   // Everything in that method must be safe to call on another thread.
   BrowserThread::ID update_histogram_thread = BrowserThread::FILE;
 #else
-  // On all other platforms, UpdateHistogram should be called on the main
+  // On all other platforms, UpdateHistograms should be called on the main
   // thread.
   BrowserThread::ID update_histogram_thread = BrowserThread::UI;
 #endif
 
   // We need to AddRef() the leaky singleton so that Bind doesn't
   // delete it prematurely.
   AddRef();
   BrowserThread::PostDelayedTask(
       update_histogram_thread, FROM_HERE,
-      base::Bind(&BrowserAccessibilityStateImpl::UpdateHistogram, this),
+      base::Bind(&BrowserAccessibilityStateImpl::UpdateHistograms, this),
       base::TimeDelta::FromSeconds(kAccessibilityHistogramDelaySecs));
 }
 
 BrowserAccessibilityStateImpl::~BrowserAccessibilityStateImpl() {
 }
 
 void BrowserAccessibilityStateImpl::OnScreenReaderDetected() {
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableRendererAccessibility)) {
     return;
   }
   SetAccessibilityMode(AccessibilityModeComplete);
 }
 
 void BrowserAccessibilityStateImpl::OnAccessibilityEnabledManually() {
   // We may want to do something different with this later.
   SetAccessibilityMode(AccessibilityModeComplete);
 }
 
 bool BrowserAccessibilityStateImpl::IsAccessibleBrowser() {
   return (accessibility_mode_ == AccessibilityModeComplete);
 }
 
 void BrowserAccessibilityStateImpl::AddHistogramCallback(
     base::Closure callback) {
   histogram_callbacks_.push_back(callback);
 }
 
-void BrowserAccessibilityStateImpl::UpdateHistogram() {
+void BrowserAccessibilityStateImpl::UpdateHistogramsForTesting() {
+  UpdateHistograms();
+}
+
+void BrowserAccessibilityStateImpl::UpdateHistograms() {
   UpdatePlatformSpecificHistograms();
 
   for (size_t i = 0; i < histogram_callbacks_.size(); ++i)
     histogram_callbacks_[i].Run();
 
   UMA_HISTOGRAM_BOOLEAN("Accessibility.State", IsAccessibleBrowser());
   UMA_HISTOGRAM_BOOLEAN("Accessibility.InvertedColors",
                         gfx::IsInvertedColorScheme());
   UMA_HISTOGRAM_BOOLEAN("Accessibility.ManuallyEnabled",
                         CommandLine::ForCurrentProcess()->HasSwitch(
                             switches::kForceRendererAccessibility));
 }
 
 #if !defined(OS_WIN)
 void BrowserAccessibilityStateImpl::UpdatePlatformSpecificHistograms() {
 }
 #endif
 
 AccessibilityMode BrowserAccessibilityStateImpl::GetAccessibilityMode() {
   return accessibility_mode_;
 }
 
 void BrowserAccessibilityStateImpl::SetAccessibilityMode(
     AccessibilityMode mode) {
   accessibility_mode_ = mode;
 }
 
 }  // namespace content