mac: Add support for asynchronous dictionary lookup

content/browser/renderer_host/text_input_client_mac.mm

Index: content/browser/renderer_host/text_input_client_mac.mm
diff --git a/content/browser/renderer_host/text_input_client_mac.mm b/content/browser/renderer_host/text_input_client_mac.mm
index b9d900a704ea47ca047bce8d9220ab57c744eaf7..35fac9a4d25caf3ca148ce4de05e3780b5e7482f 100644
--- a/content/browser/renderer_host/text_input_client_mac.mm
+++ b/content/browser/renderer_host/text_input_client_mac.mm
@@ -22,7 +22,8 @@ const float kWaitTimeout = 1500;
 TextInputClientMac::TextInputClientMac()
     : character_index_(NSNotFound),
       lock_(),
-      condition_(&lock_) {
+      condition_(&lock_),
+      replyHandler_(nil) {
 }
 
 TextInputClientMac::~TextInputClientMac() {
@@ -33,6 +34,26 @@ TextInputClientMac* TextInputClientMac::GetInstance() {
   return Singleton<TextInputClientMac>::get();
 }
 
+void TextInputClientMac::GetStringAtPoint(RenderWidgetHost* rwh,
+    gfx::Point point,
+    void (^replyHandler)(NSAttributedString*, NSRect)) {
+  RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
+  rwhi->Send(new TextInputClientMsg_StringAtPoint(rwhi->GetRoutingID(),
+                                                  point));
+  if (replyHandler_ != nil)
+    [replyHandler_ release];
+  replyHandler_ = [replyHandler copy];
+}
+
+void TextInputClientMac::GetStringAtPointReply(NSAttributedString* string,
+    NSRect rect) {
+  if (replyHandler_ != nil) {
+    replyHandler_(string, rect);
+    [replyHandler_ release];
+    replyHandler_ = nil;
+  }
+}
+
 NSUInteger TextInputClientMac::GetCharacterIndexAtPoint(RenderWidgetHost* rwh,
     gfx::Point point) {
   base::TimeTicks start = base::TimeTicks::Now();