Reimplement web content accessibility by caching in browser process

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
===================================================================
--- chrome/browser/renderer_host/render_view_host.cc	(revision 46908)
+++ chrome/browser/renderer_host/render_view_host.cc	(working copy)
@@ -676,6 +676,10 @@
   return sudden_termination_allowed_ || process()->sudden_termination_allowed();
 }
 
+void RenderViewHost::RequestAccessibilityTree() {
+  Send(new ViewMsg_GetAccessibilityTree(routing_id()));
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // RenderViewHost, IPC message handlers:
 
@@ -828,6 +832,7 @@
     IPC_MESSAGE_HANDLER(ViewHostMsg_PageContents, OnPageContents)
     IPC_MESSAGE_HANDLER(ViewHostMsg_PageTranslated, OnPageTranslated)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ContentBlocked, OnContentBlocked)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_AccessibilityTree, OnAccessibilityTree)
     // Have the super handle all other messages.
     IPC_MESSAGE_UNHANDLED(RenderWidgetHost::OnMessageReceived(msg))
   IPC_END_MESSAGE_MAP_EX()
@@ -1826,23 +1831,18 @@
 }
 
 void RenderViewHost::OnAccessibilityFocusChange(int acc_obj_id) {
-#if defined(OS_WIN)
-  BrowserAccessibilityManager::GetInstance()->ChangeAccessibilityFocus(
-      acc_obj_id, process()->id(), routing_id());
-#else
-  // TODO(port): accessibility not yet implemented. See http://crbug.com/8288.
-#endif
+  view()->OnAccessibilityFocusChange(acc_obj_id);
 }
 
 void RenderViewHost::OnAccessibilityObjectStateChange(int acc_obj_id) {
-#if defined(OS_WIN)
-  BrowserAccessibilityManager::GetInstance()->OnAccessibilityObjectStateChange(
-      acc_obj_id, process()->id(), routing_id());
-#else
-  // TODO(port): accessibility not yet implemented. See http://crbug.com/8288.
-#endif
+  view()->OnAccessibilityObjectStateChange(acc_obj_id);
 }
 
+void RenderViewHost::OnAccessibilityTree(
+    const webkit_glue::WebAccessibility& tree) {
+  view()->UpdateAccessibilityTree(tree);
+}
+
 void RenderViewHost::OnCSSInserted() {
   delegate_->DidInsertCSS();
 }