Add picker view for Web Share Target.

chrome/browser/ui/browser_dialogs.h

Index: chrome/browser/ui/browser_dialogs.h
diff --git a/chrome/browser/ui/browser_dialogs.h b/chrome/browser/ui/browser_dialogs.h
index 6d2df0169030a256d3899b473bd0899e5bc1b1ff..aa4335d8a53775b43d1f7dc10ad2c1e79d00d2a4 100644
--- a/chrome/browser/ui/browser_dialogs.h
+++ b/chrome/browser/ui/browser_dialogs.h
@@ -152,6 +152,14 @@ void ShowBookmarkEditorViews(gfx::NativeWindow parent_window,
 
 void ShowPaymentRequestDialog(payments::PaymentRequest* request);
 
+// Shows the dialog to choose a share target app. |targets| is a list of app
+// titles that will be shown in a list. Calls |callback| with true if an app was
+// chosen, or false if the dialog was cancelled.
+// TODO(mgiuca): Callback should provide info about the picked app.
+void ShowWebShareTargetPickerDialog(gfx::NativeWindow parent_window,
+                                    const std::vector<base::string16>& targets,
+                                    const base::Callback<void(bool)>& callback);
+
 #if defined(OS_MACOSX)
 
 // This is a class so that it can be friended from ContentSettingBubbleContents,