Make net::URLRequestContext a MemoryDumpProvider

net/url_request/url_request_context.h

Index: net/url_request/url_request_context.h
diff --git a/net/url_request/url_request_context.h b/net/url_request/url_request_context.h
index 0158d9aca17282fb5153f318f65d596a3c5fb6ef..24b03bb8a58dc86d11cb99c835e288367bb56e7f 100644
--- a/net/url_request/url_request_context.h
+++ b/net/url_request/url_request_context.h
@@ -16,6 +16,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
+#include "base/trace_event/memory_dump_provider.h"
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
 #include "net/http/http_network_session.h"
@@ -24,6 +25,12 @@
 #include "net/ssl/ssl_config_service.h"
 #include "net/url_request/url_request.h"
 
+namespace base {
+namespace trace_event {
+class ProcessMemoryDump;
+}
+}
+
 namespace net {
 class CertVerifier;
 class ChannelIDService;
@@ -51,10 +58,11 @@ class URLRequestThrottlerManager;
 // URLRequestContext rather than creating a new one, as guaranteeing that the
 // URLRequestContext is destroyed before its members can be difficult.
 class NET_EXPORT URLRequestContext
-    : NON_EXPORTED_BASE(public base::NonThreadSafe) {
+    : NON_EXPORTED_BASE(public base::NonThreadSafe),
+      public base::trace_event::MemoryDumpProvider {
  public:
   URLRequestContext();
-  virtual ~URLRequestContext();
+  ~URLRequestContext() override;
 
   // Copies the state from |other| into this context.
   void CopyFrom(const URLRequestContext* other);
@@ -230,6 +238,15 @@ class NET_EXPORT URLRequestContext
 
   bool enable_brotli() const { return enable_brotli_; }
 
+  // Sets a name for this URLRequestContext. Currently the name is used in
+  // MemoryDumpProvier to annotate memory usage. The name does not need to be
+  // unique.
+  void set_name(const std::string& name) { name_ = name; }
+
+  // MemoryDumpProvider implementation:
+  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
+                    base::trace_event::ProcessMemoryDump* pmd) override;
+
  private:
   // ---------------------------------------------------------------------------
   // Important: When adding any new members below, consider whether they need to
@@ -269,6 +286,11 @@ class NET_EXPORT URLRequestContext
   // Enables Brotli Content-Encoding support.
   bool enable_brotli_;
 
+  // An optional name which can be set to describe this URLRequestContext.
+  // Used in MemoryDumpProvier to annotate memory usage. The name does not need
+  // to be unique.
+  std::string name_;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequestContext);
 };