[tracing] Add names to memory-infra dumpers for debugging

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index 947f020f3a5c0ef6ff3b9239fe29367e59ca7d14..9cce753c2c283e64eec5a886c1651fbef35611b0 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -576,9 +576,10 @@ public:
 
     // Registers a memory dump provider. The WebMemoryDumpProvider::onMemoryDump
     // method will be called on the same thread that called the
-    // registerMemoryDumpProvider() method.
+    // registerMemoryDumpProvider() method. |name| is used for debugging
+    // (duplicates are allowed) and must be a long-lived C string.
     // See crbug.com/458295 for design docs.
-    virtual void registerMemoryDumpProvider(blink::WebMemoryDumpProvider*) { }
+    virtual void registerMemoryDumpProvider(blink::WebMemoryDumpProvider*, const char* name) { }
 
     // Must be called on the thread that called registerMemoryDumpProvider().
     virtual void unregisterMemoryDumpProvider(blink::WebMemoryDumpProvider*) { }