Add Chrome OS accessibility histograms.

chrome/browser/chromeos/accessibility/accessibility_util.cc

Index: chrome/browser/chromeos/accessibility/accessibility_util.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_util.cc b/chrome/browser/chromeos/accessibility/accessibility_util.cc
index 2340e75a223f961cced1a70624e30f2ecf9abe06..ca58c196fddec08fe687d51621adc060c50b0448 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_util.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_util.cc
@@ -13,6 +13,7 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "chrome/browser/accessibility/accessibility_extension_api.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/accessibility/magnification_manager.h"
@@ -28,6 +29,7 @@
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/extensions/user_script.h"
 #include "chrome/common/pref_names.h"
+#include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
@@ -108,6 +110,23 @@ class ContentScriptLoader {
   std::queue<ExtensionResource> resources_;
 };
 
+void UpdateChromeOSAccessibilityHistograms() {
+  UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosSpokenFeedback",

[Nikita (slow), 2012/11/29 18:29:23]

Should you also report histograms if users enable/disable CrosSpokenFeedback
during session but that is disabled on boot/initialize?

+			IsSpokenFeedbackEnabled());
+  UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosHighContrast",
+			IsHighContrastEnabled());
+  UMA_HISTOGRAM_BOOLEAN("Accessibility.CrosVirtualKeyboard",
+			IsVirtualKeyboardEnabled());
+  UMA_HISTOGRAM_ENUMERATION("Accessibility.CrosScreenMagnifier",
+			    GetScreenMagnifierType(),
+			    3);
+}
+
+void Initialize() {
+  content::BrowserAccessibilityState::GetInstance()->AddHistogramCallback(
+      base::Bind(&UpdateChromeOSAccessibilityHistograms));
+}
+
 void EnableSpokenFeedback(bool enabled, content::WebUI* login_web_ui) {
   bool spoken_feedback_enabled = g_browser_process &&
       g_browser_process->local_state()->GetBoolean(
@@ -245,6 +264,16 @@ bool IsHighContrastEnabled() {
   return high_contrast_enabled;
 }
 
+bool IsVirtualKeyboardEnabled() {
+  if (!g_browser_process) {
+    return false;
+  }
+  PrefService* prefs = g_browser_process->local_state();
+  bool virtual_keyboard_enabled = prefs &&
+      prefs->GetBoolean(prefs::kVirtualKeyboardEnabled);
+  return virtual_keyboard_enabled;
+}
+
 ScreenMagnifierType GetScreenMagnifierType() {
   if (!MagnificationManager::GetInstance())
     return MAGNIFIER_OFF;