Adds MSAA/IAccessible exposure of web content.

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
===================================================================
--- chrome/renderer/render_view.cc	(revision 2530)
+++ chrome/renderer/render_view.cc	(working copy)
@@ -310,7 +310,8 @@
                         OnAllowDomAutomationBindings)
     IPC_MESSAGE_HANDLER(ViewMsg_AllowBindings, OnAllowBindings)
     IPC_MESSAGE_HANDLER(ViewMsg_SetDOMUIProperty, OnSetDOMUIProperty)
-    IPC_MESSAGE_HANDLER(ViewMsg_DragSourceEndedOrMoved, OnDragSourceEndedOrMoved)
+    IPC_MESSAGE_HANDLER(ViewMsg_DragSourceEndedOrMoved,
+                        OnDragSourceEndedOrMoved)
     IPC_MESSAGE_HANDLER(ViewMsg_DragSourceSystemDragEnded,
                         OnDragSourceSystemDragEnded)
     IPC_MESSAGE_HANDLER(ViewMsg_SetInitialFocus, OnSetInitialFocus)
@@ -328,6 +329,9 @@
     IPC_MESSAGE_HANDLER(ViewMsg_GetSerializedHtmlDataForCurrentPageWithLocalLinks,
                         OnGetSerializedHtmlDataForCurrentPageWithLocalLinks)
     IPC_MESSAGE_HANDLER(ViewMsg_GetApplicationInfo, OnGetApplicationInfo)
+    IPC_MESSAGE_HANDLER(ViewMsg_GetAccessibilityInfo, OnGetAccessibilityInfo)
+    IPC_MESSAGE_HANDLER(ViewMsg_ClearAccessibilityInfo,
+                        OnClearAccessibilityInfo)
     IPC_MESSAGE_HANDLER(ViewMsg_ShouldClose, OnMsgShouldClose)
     IPC_MESSAGE_HANDLER(ViewMsg_ClosePage, OnClosePage)
     IPC_MESSAGE_HANDLER(ViewMsg_ThemeChanged, OnThemeChanged)
@@ -1050,6 +1054,11 @@
   // we don't want the transition type to persist.
   if (extra_data)
     extra_data->transition_type = PageTransition::LINK;  // Just clear it.
+
+  if (glue_accessibility_.get()) {
+    // Clear accessibility info cache. 
+    glue_accessibility_->ClearIAccessibleMap(-1, true);
+  }
 }
 
 // Tell the embedding application that the title of the active page has changed
@@ -1145,7 +1154,7 @@
     NavigationGesture gesture) {
   if (webview->GetMainFrame() == frame) {
     navigation_gesture_ = gesture;
-    
+
     // Make sure redirect tracking state is clear for the new load.
     completed_client_redirect_src_ = GURL();
   }
@@ -2258,8 +2267,7 @@
 }
 
 void RenderView::OnAllowBindings(bool enable_dom_ui_bindings,
-                                 bool enable_external_host_bindings)
-{
+                                 bool enable_external_host_bindings) {
   enable_dom_ui_bindings_ = enable_dom_ui_bindings;
   enable_external_host_bindings_ = enable_external_host_bindings;
 }
@@ -2404,6 +2412,29 @@
   history_forward_list_count_ = forward_list_count;
 }
 
+void RenderView::OnGetAccessibilityInfo(
+    const ViewMsg_Accessibility_In_Params& in_params,
+    ViewHostMsg_Accessibility_Out_Params* out_params) {
+
+  if (!glue_accessibility_.get())
+    glue_accessibility_.reset(new GlueAccessibility());
+
+  if (!glue_accessibility_->
+       GetAccessibilityInfo(webview(), in_params, out_params)) {
+    return;
+  }
+}
+
+void RenderView::OnClearAccessibilityInfo(int iaccessible_id, bool clear_all) {
+  if (!glue_accessibility_.get()) {
+    // If accessibility is not activated, ignore clearing message.
+    return;
+  }
+
+  if (!glue_accessibility_->ClearIAccessibleMap(iaccessible_id, clear_all))
+    return;
+}
+
 void RenderView::OnGetAllSavableResourceLinksForCurrentPage(
     const GURL& page_url) {
   // Prepare list to storage all savable resource links.