Add frame-specific InterfaceProviderSpec.

content/common/frame.mojom

Index: content/common/frame.mojom
diff --git a/content/common/frame.mojom b/content/common/frame.mojom
index 5bde8c3f19b8519c787789b4489aafd40d074316..f751a31a5dbc1c6a350d9f3c6c5a936444ae0630 100644
--- a/content/common/frame.mojom
+++ b/content/common/frame.mojom
@@ -6,6 +6,10 @@ module content.mojom;
 
 import "services/service_manager/public/interfaces/interface_provider.mojom";
 
+// The name of the InterfaceProviderSpec in service manifests used by the
+// frame tree to expose frame-specific interfaces between renderer and browser.
+const string kNavigation_FrameSpec = "navigation:frame";
+
 // Implemented by the frame provider (e.g. renderer processes).
 interface Frame {
   GetInterfaceProvider(service_manager.mojom.InterfaceProvider& interfaces);