[tracing] Add SkResourceCache as suballocation to avoid double counting.

base/memory/discardable_shared_memory.h

Index: base/memory/discardable_shared_memory.h
diff --git a/base/memory/discardable_shared_memory.h b/base/memory/discardable_shared_memory.h
index 74bbe8e95f427ba347d696e6c6e9c408e166e167..459deb8ed354ddd257aff2f64062ce0a18e60ed4 100644
--- a/base/memory/discardable_shared_memory.h
+++ b/base/memory/discardable_shared_memory.h
@@ -29,6 +29,13 @@ namespace base {
 // access to an instance of this class.
 class BASE_EXPORT DiscardableSharedMemory {
  public:
+  // Used by other allocators to expess sub-allocation from discardable memory
+  // heap for tracing. To expess any suballocation, the dump providers need to
+  // create a sub-allocation edge from this node.
+  // Eg. : ProcessMemoryDump::AddSuballocation(skia_dump_guid,

[petrcermak, 2015/07/29 16:38:59]

nit: There should be a dot after "E" and no space before the colon.

[ssid, 2015/07/29 16:57:37]

Done.

+  //                                           kDiscardableSegmentsDumpName);

[petrcermak, 2015/07/29 16:38:59]

How is this related to the constant??? Shouldn't it be
s/kDiscardableSegmentsDumpName/kAllocatedObjectsDumpName/?

[ssid, 2015/07/29 16:57:37]

Done.

+  static const char kAllocatedObjectsDumpName[];
+
   enum LockResult { SUCCESS, PURGED, FAILED };
 
   DiscardableSharedMemory();