Make SdchOwner a client of memory coordinator

net/sdch/sdch_owner.h

Index: net/sdch/sdch_owner.h
diff --git a/net/sdch/sdch_owner.h b/net/sdch/sdch_owner.h
index 48a7db2ec5562b44d5dbbddf82c7732596491179..5ad2e1b913d3c85793be790188fe8586acbc78c3 100644
--- a/net/sdch/sdch_owner.h
+++ b/net/sdch/sdch_owner.h
@@ -12,6 +12,7 @@
 #include <string>
 
 #include "base/macros.h"
+#include "base/memory/memory_coordinator_client.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/sdch_observer.h"
@@ -31,7 +32,8 @@ class URLRequestContext;
 // exposes interface for setting SDCH policy.  It should be instantiated by
 // the net/ embedder.
 // TODO(rdsmith): Implement dictionary prioritization.
-class NET_EXPORT SdchOwner : public SdchObserver {
+class NET_EXPORT SdchOwner : public SdchObserver,
+                             public base::MemoryCoordinatorClient {
  public:
   // Abstact storage interface for storing settings that allows the embedder
   // to provide the appropriate storage backend.
@@ -156,9 +158,15 @@ class NET_EXPORT SdchOwner : public SdchObserver {
     DictionaryInfo& operator=(const DictionaryInfo& rhs) = default;
   };
 
+  // base::MemoryCoordinatorClient implementation:
+  void OnMemoryStateChange(base::MemoryState state) override;
+
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel level);
 
+  // Clears data to save memory usage.
+  void ClearData();
+
   // Schedule loading of all dictionaries described in |persisted_info|.
   // Returns false and does not schedule a load if |persisted_info| has an
   // unsupported version or no dictionaries key. Skips any dictionaries that are