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 66d37aa401b74c7efd73d0b682c6ca1523be30b8..2cdf3e1ee738966c8ad0ab7da083a080a545c388 100644
--- a/chrome/browser/ui/browser_dialogs.h
+++ b/chrome/browser/ui/browser_dialogs.h
@@ -12,6 +12,7 @@
 #include "base/callback.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/bookmarks/bookmark_editor.h"
+#include "chrome/browser/webshare/share_service_impl.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ -157,6 +158,15 @@ void ShowBookmarkEditorViews(gfx::NativeWindow parent_window,
 payments::PaymentRequestDialog* CreatePaymentRequestDialog(
     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 SHARE if an app
+// was chosen, or CANCEL 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(SharePickerResult)>& callback);
+
 #if defined(OS_MACOSX)
 
 // This is a class so that it can be friended from ContentSettingBubbleContents,