Expose data reduction proxy auth token for internal builds.

components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
index fc4819629c4e9a94a1132f99bc50ca1e6fe282e5..586262d9244f01aeae2be3ef3d30399faf101297 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
@@ -23,6 +23,10 @@
 #include "net/url_request/url_request.h"
 #include "url/gurl.h"
 
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#include "google_apis/google_api_keys.h"
+#endif
+
 namespace data_reduction_proxy {
 
 // The empty version for the authentication protocol. Currently used by
@@ -217,6 +221,14 @@ std::string DataReductionProxyAuthRequestHandler::GetDefaultKey() const {
   if (key.empty())
     key = SPDY_PROXY_AUTH_VALUE;
 #endif
+
+#if !defined(OS_ANDROID) && !defined(OS_IOS)

[bengr, 2014/10/10 00:26:07]

Presuming this doesn't bloat WebView or Cronet, can we use this approach on all
platforms?

[Not at Google. Contact bengr, 2014/10/10 18:55:43]

It will increase the size by about 1.4M. Also the gypi mechanism better and we
might be able to make use of that in the future for all platforms.

+  // On Android and iOS this value is obtained from supplement.gypi. We avoid

[bengr, 2014/10/10 00:26:06]

I wouldn't describe how internal code works. Instead, add a comment above line
220 that says:

// Android and iOS get the default key from a preprocessor constant. All other
platforms
// get the key from google_apis.

[Not at Google. Contact bengr, 2014/10/10 18:55:43]

Done.

+  // this dependency when possible to reduce the size of this component.
+  if (key.empty()) {
+    key = google_apis::GetSpdyProxyAuthValue();
+  }
+#endif
   return key;
 }