Add private extension API to move the accessibility focus ring.

BUG=314889

Review URL: https://codereview.chromium.org/560983002

Cr-Commit-Position: refs/heads/master@{#294719}

chrome/browser/accessibility/accessibility_extension_api.cc

@@ -25,6 +25,10 @@
 #include "extensions/common/error_utils.h"
 #include "extensions/common/manifest_handlers/background_info.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/ui/accessibility_focus_ring_controller.h"
+#endif
+
 namespace keys = extension_accessibility_api_constants;
 namespace accessibility_private = extensions::api::accessibility_private;
 
@@ -308,3 +312,29 @@ bool AccessibilityPrivateGetAlertsForTabFunction::RunSync() {
   SetResult(alerts_value);
   return true;
 }
+
+bool AccessibilityPrivateSetFocusRingFunction::RunSync() {
+#if defined(OS_CHROMEOS)
+  base::ListValue* rect_values = NULL;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetList(0, &rect_values));
+
+  std::vector<gfx::Rect> rects;
+  for (size_t i = 0; i < rect_values->GetSize(); ++i) {
+    base::DictionaryValue* rect_value = NULL;
+    EXTENSION_FUNCTION_VALIDATE(rect_values->GetDictionary(i, &rect_value));
+    int left, top, width, height;
+    EXTENSION_FUNCTION_VALIDATE(rect_value->GetInteger("left", &left));
+    EXTENSION_FUNCTION_VALIDATE(rect_value->GetInteger("top", &top));
+    EXTENSION_FUNCTION_VALIDATE(rect_value->GetInteger("width", &width));
+    EXTENSION_FUNCTION_VALIDATE(rect_value->GetInteger("height", &height));
+    rects.push_back(gfx::Rect(left, top, width, height));
+  }
+
+  chromeos::AccessibilityFocusRingController::GetInstance()->SetFocusRing(
+      rects);
+  return true;
+#endif  // defined(OS_CHROMEOS)
+
+  error_ = keys:: kErrorNotSupported;
+  return false;
+}

chrome/browser/accessibility/accessibility_extension_api.h

@@ -135,4 +135,13 @@ class AccessibilityPrivateGetAlertsForTabFunction
                              ACCESSIBILITY_PRIVATE_GETALERTSFORTAB)
 };
 
+// API function that sets the location of the accessibility focus ring.
+class AccessibilityPrivateSetFocusRingFunction
+    : public ChromeSyncExtensionFunction {
+  virtual ~AccessibilityPrivateSetFocusRingFunction() {}
+  virtual bool RunSync() OVERRIDE;
+  DECLARE_EXTENSION_FUNCTION("accessibilityPrivate.setFocusRing",
+                             ACCESSIBILITY_PRIVATE_SETFOCUSRING)
+};
+
 #endif  // CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_H_

chrome/browser/accessibility/accessibility_extension_api_constants.cc

@@ -42,4 +42,7 @@ const char kTypeTree[] = "tree";
 const char kTypeTreeItem[] = "treeitem";
 const char kTypeWindow[] = "window";
 
+// Errors.
+const char kErrorNotSupported[] = "This API is not supported on this platform.";
+
 }  // namespace extension_accessibility_api_constants

chrome/browser/accessibility/accessibility_extension_api_constants.h

@@ -46,6 +46,9 @@ extern const char kTypeTreeItem[];
 extern const char kTypeVolume[];
 extern const char kTypeWindow[];
 
+// Errors.
+extern const char kErrorNotSupported[];
+
 };  // namespace extension_accessibility_api_constants
 
 #endif  // CHROME_BROWSER_ACCESSIBILITY_ACCESSIBILITY_EXTENSION_API_CONSTANTS_H_

chrome/common/extensions/api/accessibility_private.json

@@ -159,6 +159,17 @@
             ]
           }
         }
+      },
+      {
+        "id": "ScreenRect",
+        "type": "object",
+        "description": "Bounding rectangle in global screen coordinates.",
+        "properties": {
+          "left": {"type": "integer", "description": "Left coordinate in global screen coordinates."},
+          "top": {"type": "integer", "description": "Top coordinate in global screen coordinates."},
+          "width": {"type": "integer", "description": "Width in pixels."},
+          "height": {"type": "integer", "description": "Height in pixels."}
+        }
       }
     ],
     "functions": [
@@ -228,6 +239,19 @@
             ]
           }
         ]
+      },
+      {
+        "name": "setFocusRing",
+        "type": "function",
+        "description": "Set the bounds of the accessibility focus ring.",
+        "parameters": [
+          {
+            "name": "rects",
+            "type": "array",
+            "items": { "$ref": "ScreenRect" },
+            "description": "Array of rectangles to draw the accessibility focus ring around."
+          }
+        ]
       }
     ],
     "events": [

extensions/browser/extension_function_histogram_value.h

@@ -951,6 +951,7 @@ enum HistogramValue {
   APP_CURRENTWINDOWINTERNAL_SETVISIBLEONALLWORKSPACES,
   EASYUNLOCKPRIVATE_GETSIGNINCHALLENGE,
   EASYUNLOCKPRIVATE_TRYSIGNINSECRET,
+  ACCESSIBILITY_PRIVATE_SETFOCUSRING,
   // Last entry: Add new entries above and ensure to update
   // tools/metrics/histograms/histograms.xml.
   ENUM_BOUNDARY

tools/metrics/histograms/histograms.xml

@@ -41548,6 +41548,7 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="890" label="APP_CURRENTWINDOWINTERNAL_SETVISIBLEONALLWORKSPACES"/>
   <int value="891" label="EASYUNLOCKPRIVATE_GETSIGNINCHALLENGE"/>
   <int value="892" label="EASYUNLOCKPRIVATE_TRYSIGNINSECRET"/>
+  <int value="893" label="ACCESSIBILITY_PRIVATE_SETFOCUSRING"/>
 </enum>
 
 <enum name="ExtensionInstallCause" type="int">