Allow the option to send selected mouse key event

Add a rightMouseKey in SyntheticMouseEvent in accessibility API to allow the option of
sending the event on the selected mouse key (left, right, middle, forward, back).
Signed-off-by: Shannon Chen <shannc@chromium.org>
Bug: None
Change-Id: Ib5cd2b1ac30dc7a5efe41b09e0bc17650916ad7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531094
Commit-Queue: Shannon Chen <shannc@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826676}

chrome/browser/accessibility/accessibility_extension_api.cc

@@ -339,8 +339,24 @@ AccessibilityPrivateSendSyntheticMouseEventFunction::Run() {
   }
 
   int flags = 0;
-  if (type != ui::ET_MOUSE_MOVED)
-    flags |= ui::EF_LEFT_MOUSE_BUTTON;
+  if (type != ui::ET_MOUSE_MOVED) {
+    switch (mouse_data->mouse_button) {
+      case accessibility_private::SYNTHETIC_MOUSE_EVENT_BUTTON_MIDDLE:
+        flags |= ui::EF_MIDDLE_MOUSE_BUTTON;
+        break;
+      case accessibility_private::SYNTHETIC_MOUSE_EVENT_BUTTON_RIGHT:
+        flags |= ui::EF_RIGHT_MOUSE_BUTTON;
+        break;
+      case accessibility_private::SYNTHETIC_MOUSE_EVENT_BUTTON_BACK:
+        flags |= ui::EF_BACK_MOUSE_BUTTON;
+        break;
+      case accessibility_private::SYNTHETIC_MOUSE_EVENT_BUTTON_FOWARD:
+        flags |= ui::EF_FORWARD_MOUSE_BUTTON;
+        break;
+      default:
+        flags |= ui::EF_LEFT_MOUSE_BUTTON;
+    }
+  }
 
   int changed_button_flags = flags;
 

chrome/common/extensions/api/accessibility_private.json

@@ -121,6 +121,12 @@
         "description": "The type of event to send",
         "enum": ["press", "release", "drag", "move", "enter", "exit"]
       },
+      {
+        "id": "SyntheticMouseEventButton",
+        "type": "string",
+        "description": "The button to send event on",
+        "enum": ["left", "middle", "right", "back", "foward"]
+      },
       {
         "id": "SyntheticMouseEvent",
         "type": "object",
@@ -132,6 +138,11 @@
             "type": "boolean",
             "description": "True if the touch accessibility flag should be set.",
             "optional": true
+          },
+          "mouseButton": {
+            "$ref": "SyntheticMouseEventButton",
+            "description": "The default mouse button is set to left if mouseButton is not specified.",
+            "optional": true
           }
         }
       },

third_party/closure_compiler/externs/accessibility_private.js

@@ -155,12 +155,24 @@ chrome.accessibilityPrivate.SyntheticMouseEventType = {
   EXIT: 'exit',
 };
 
+/**
+ * @enum {string}
+ */
+chrome.accessibilityPrivate.SyntheticMouseEventButton = {
+  LEFT: 'left',
+  MIDDLE: 'middle',
+  RIGHT: 'right',
+  BACK: 'back',
+  FOWARD: 'foward',
+};
+
 /**
  * @typedef {{
  *   type: !chrome.accessibilityPrivate.SyntheticMouseEventType,
  *   x: number,
  *   y: number,
- *   touchAccessibility: (boolean|undefined)
+ *   touchAccessibility: (boolean|undefined),
+ *   mouseButton: (!chrome.accessibilityPrivate.SyntheticMouseEventButton|undefined)
  * }}
  */
 chrome.accessibilityPrivate.SyntheticMouseEvent;