[Mac]: Enable speech sub-menu under the edit menu and pipe it through to the renderer.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
===================================================================
--- content/browser/renderer_host/render_widget_host_view_mac.mm	(revision 148651)
+++ content/browser/renderer_host/render_widget_host_view_mac.mm	(working copy)
@@ -65,6 +65,13 @@
 using WebKit::WebMouseWheelEvent;
 using WebKit::WebGestureEvent;
 
+// These are not documented, so use only after checking -respondsToSelector:.
+@interface NSApplication (UndocumentedSpeechMethods)
+- (void)speakString:(NSString*)string;
+- (void)stopSpeaking:(id)sender;
+- (BOOL)isSpeaking;
+@end
+
 // Declare things that are part of the 10.7 SDK.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
@@ -746,6 +753,10 @@
   }
 }
 
+void RenderWidgetHostViewMac::SpeakText(const string16& text) {
+  [NSApp speakString:base::SysUTF16ToNSString(text)];

[Nico, 2012/07/27 22:44:26]

"These are not documented, so use only after checking -respondsToSelector:."?

[Alexei Svitkine (slow), 2012/07/27 22:49:48]

We wouldn't get here unless respondsToSelector: is true per
validateUserInterfaceItem:.

Do you want me to add the check anyway? Maybe a comment would be better, what do
you think.

[Nico, 2012/07/27 22:57:56]

Comment sounds good.

[Alexei Svitkine (slow), 2012/07/28 15:29:12]

Done.

+}
+
 //
 // RenderWidgetHostViewCocoa uses the stored selection text,
 // which implements NSServicesRequests protocol.
@@ -2336,6 +2347,15 @@
 
   SEL action = [item action];
 
+  if (action == @selector(stopSpeaking:)) {
+    return [NSApp respondsToSelector:@selector(isSpeaking)] &&
+           [NSApp isSpeaking];
+  }
+  if (action == @selector(startSpeaking:)) {
+    return [NSApp respondsToSelector:@selector(speakString:)] &&
+           renderWidgetHostView_->render_widget_host_->IsRenderView();
+  }
+
   // For now, these actions are always enabled for render view,
   // this is sub-optimal.
   // TODO(suzhe): Plumb the "can*" methods up from WebCore.
@@ -3068,6 +3088,17 @@
   }
 }
 
+- (void)startSpeaking:(id)sender {
+  if (renderWidgetHostView_->render_widget_host_->IsRenderView()) {
+    static_cast<RenderViewHostImpl*>(
+        renderWidgetHostView_->render_widget_host_)->SpeakSelection();
+  }
+}
+
+- (void)stopSpeaking:(id)sender {
+  [NSApp stopSpeaking:sender];

[Nico, 2012/07/27 22:44:26]

ditto

[Alexei Svitkine (slow), 2012/07/27 22:49:48]

same reply

+}
+
 - (void)cancelComposition {
   if (!hasMarkedText_)
     return;