Using API key specified from js

components/copresence/public/copresence_client_delegate.h

Index: components/copresence/public/copresence_client_delegate.h
diff --git a/components/copresence/public/copresence_client_delegate.h b/components/copresence/public/copresence_client_delegate.h
index 7698aecf5c119e7a0a77a078c32f12dc0c8a0d0f..0d64063a7077a7ecc66a363eacaacb6ffd6fe4ea 100644
--- a/components/copresence/public/copresence_client_delegate.h
+++ b/components/copresence/public/copresence_client_delegate.h
@@ -16,6 +16,7 @@ class URLRequestContextGetter;
 
 namespace copresence {
 
+class DeviceFingerprint;
 class Message;
 class WhispernetClient;
 
@@ -35,8 +36,8 @@ class CopresenceClientDelegate {
       const std::vector<Message>& message) = 0;
 
   virtual net::URLRequestContextGetter* GetRequestContext() const = 0;
-
-  virtual const std::string GetPlatformVersionString() const = 0;
+  virtual const DeviceFingerprint& GetDeviceFingerprint() const = 0;

[rkc, 2014/08/13 21:45:31]

This proto can be constructed on the Copresence side without requiring an
explicit API. If it at a later point it does need any data from the consumer,
let us get that data, not the proto itself. This API should not introduce any
dependencies on internal Copresence code.

[Charlie, 2014/08/13 22:53:37]

The client already depends on our protos, because the only thing it does is to
execute a ReportRequest. In fact maybe the protos should be in the public/
directory. Anyway, it will be easier for users of the component (e.g. from
Brillo) to set this correctly if it is exposed.

[rkc, 2014/08/13 23:11:36]

Report request is is required for every report to exist. DeviceFingerprint is a
technical detail that we didn't even need to set till now. Reusing a proto
instead of creating another in-between translation API for operations makes
sense. Having a client provide a technical detail of our API isn't something we
should get into.

+  virtual const std::string& GetAPIKey() const = 0;
 
   virtual WhispernetClient* GetWhispernetClient() = 0;
 };