Add chrome.accessibilityFeatures.cursorColor implementation

CL:2261179 added a definition of this API, but there was no
implementation for it.
This CL adds it.

Bug: 1127721
Test: browser_test AccessibilityFeaturesApiTest
Change-Id: I131406370e6e81599286bb02b5dd3e0dd6761aef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2407937
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811488}

chrome/browser/chromeos/extensions/accessibility_features_apitest.cc

@@ -188,6 +188,7 @@ IN_PROC_BROWSER_TEST_P(AccessibilityFeaturesApiTest, Get) {
   // WARNING: Make sure that features which load Chrome extension are not among
   // enabled_features (see |Set| test for the reason).
   std::vector<std::string> enabled_features = {
+      "cursorColor",
       "cursorHighlight",
       "highContrast",
       "largeCursor",
@@ -241,6 +242,7 @@ IN_PROC_BROWSER_TEST_P(AccessibilityFeaturesApiTest, Get_ComponentApp) {
   std::vector<std::string> disabled_features = {
       "autoclick",
       "caretHighlight",
+      "cursorColor",
       "focusHighlight",
       "screenMagnifier",
       "selectToSpeak",
@@ -275,6 +277,7 @@ IN_PROC_BROWSER_TEST_P(AccessibilityFeaturesApiTest, Set) {
   // would induce loading of Chrome extension.
   std::vector<std::string> enabled_features = {
       "caretHighlight",
+      "cursorColor",
       "focusHighlight",
       "stickyKeys",
   };
@@ -319,6 +322,7 @@ IN_PROC_BROWSER_TEST_F(AccessibilityFeaturesApiTest, ObserveFeatures) {
   // enabled_features (see |Set| test for the reason).
   std::vector<std::string> enabled_features = {
       "caretHighlight",
+      "cursorColor",
       "dockedMagnifier",
       "focusHighlight",
       "stickyKeys",

chrome/browser/extensions/api/preference/preference_api.cc

@@ -153,6 +153,9 @@ const PrefMappingEntry kPrefMapping[] = {
     {"caretHighlight", ash::prefs::kAccessibilityCaretHighlightEnabled,
      APIPermission::kAccessibilityFeaturesRead,
      APIPermission::kAccessibilityFeaturesModify},
+    {"cursorColor", ash::prefs::kAccessibilityCursorColorEnabled,
+     APIPermission::kAccessibilityFeaturesRead,
+     APIPermission::kAccessibilityFeaturesModify},
     {"cursorHighlight", ash::prefs::kAccessibilityCursorHighlightEnabled,
      APIPermission::kAccessibilityFeaturesRead,
      APIPermission::kAccessibilityFeaturesModify},

chrome/common/extensions/api/accessibility_features.json

@@ -63,7 +63,7 @@
       },
       "cursorColor": {
         "$ref": "types.ChromeSetting",
-        "description": "<p><strong>ChromeOS only.</strong></p><p>Cursor color. The value indicates whether the feature is enabled or not. <code>get()</code> requires <code>accessibilityFeatures.read</code> permission. <code>set()</code> and <code>clear()</code> require <code>accessibilityFeatures.modify</code> permission.</p>",
+        "description": "<p><strong>ChromeOS only.</strong></p><p>Cursor color. The value indicates whether the feature is enabled or not, doesn't indicate the color of it. <code>get()</code> requires <code>accessibilityFeatures.read</code> permission. <code>set()</code> and <code>clear()</code> require <code>accessibilityFeatures.modify</code> permission.</p>",
         "value": ["cursorColor", {"type": "boolean"}],
         "platforms": ["chromeos"]
       },