Convert network hints to Mojo

components/network_hints/renderer/renderer_dns_prefetch.h

Index: components/network_hints/renderer/renderer_dns_prefetch.h
diff --git a/components/network_hints/renderer/renderer_dns_prefetch.h b/components/network_hints/renderer/renderer_dns_prefetch.h
index 9df9e5b9e00bdca1e54cac5b72fb531d2c34d2d1..5c409b2e010f1536e0c093af809ecbed434d0237 100644
--- a/components/network_hints/renderer/renderer_dns_prefetch.h
+++ b/components/network_hints/renderer/renderer_dns_prefetch.h
@@ -28,10 +28,13 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "components/network_hints/common/network_hints.mojom.h"
 #include "components/network_hints/renderer/dns_prefetch_queue.h"
 
 namespace network_hints {
 
+class NetworkHints;
+
 // An internal interface to the network_hints component for efficiently sending
 // DNS prefetch requests to the net stack.
 class RendererDnsPrefetch {
@@ -77,6 +80,9 @@ class RendererDnsPrefetch {
   // This discards ALL queue entries, and map entries.
   void Reset();
 
+  // Ensure that the Mojo connection to NetworkHints has been created.
+  void EnsureConnected();

[Sam McNally, 2016/07/12 05:25:30]

I would prefer a getter that returns a mojom::NetworkHints& that connects if
necessary.

[tibell, 2016/07/12 07:14:24]

Done.

+
   // We use c_string_queue_ to hold lists of names supplied typically) by the
   // renderer.  It queues the names, at minimal cost to the renderer's thread,
   // and allows this class to process them when time permits (in a later task).
@@ -101,6 +107,10 @@ class RendererDnsPrefetch {
   int buffer_full_discard_count_;
   int numeric_ip_discard_count_;
 
+  // |EnsureConnected()| must be called before sending messages using
+  // |network_hints_|.
+  mojom::NetworkHintsPtr network_hints_;
+
   base::WeakPtrFactory<RendererDnsPrefetch> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererDnsPrefetch);