Track SimpleCache memory usage in net/ MemoryDumpProvider

net/http/http_cache_unittest.cc

Index: net/http/http_cache_unittest.cc
diff --git a/net/http/http_cache_unittest.cc b/net/http/http_cache_unittest.cc
index 635c15ca98b101b35f2087019bb9f5f31303ac18..92d9d75a85e6e6fb2e2953abc4f37284a5f2c11b 100644
--- a/net/http/http_cache_unittest.cc
+++ b/net/http/http_cache_unittest.cc
@@ -21,6 +21,8 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/simple_test_clock.h"
+#include "base/trace_event/memory_allocator_dump.h"
+#include "base/trace_event/process_memory_dump.h"
 #include "net/base/cache_type.h"
 #include "net/base/elements_upload_data_stream.h"
 #include "net/base/host_port_pair.h"
@@ -8328,4 +8330,41 @@ TEST(HttpCache, CacheEntryStatusCantConditionalize) {
             response_info.cache_entry_status);
 }
 
+// Basic test to make sure HttpCache::DumpMemoryStats doesn't crash.
+TEST(HttpCache, DumpMemoryStats) {
+  MockHttpCache cache;
+  cache.FailConditionalizations();
+  RunTransactionTest(cache.http_cache(), kTypicalGET_Transaction);
+
+  HttpResponseInfo response_info;
+  RunTransactionTestWithResponseInfo(cache.http_cache(),
+                                     kTypicalGET_Transaction, &response_info);
+
+  EXPECT_FALSE(response_info.was_cached);
+  EXPECT_TRUE(response_info.network_accessed);
+  EXPECT_EQ(CacheEntryStatus::ENTRY_CANT_CONDITIONALIZE,
+            response_info.cache_entry_status);
+
+  base::trace_event::MemoryDumpArgs dump_args = {
+      base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
+  std::unique_ptr<base::trace_event::ProcessMemoryDump> process_memory_dump(
+      new base::trace_event::ProcessMemoryDump(nullptr, dump_args));
+  base::trace_event::MemoryAllocatorDump* parent_dump =
+      process_memory_dump->CreateAllocatorDump("parent");
+  cache.http_cache()->DumpMemoryStats(process_memory_dump.get(),
+                                      parent_dump->absolute_name());
+
+  // Whether HttpCache::DumpMemoryStats() is invoked.
+  bool did_dump = false;
+  const base::trace_event::ProcessMemoryDump::AllocatorDumpsMap&
+      allocator_dumps = process_memory_dump->allocator_dumps();
+  for (const auto& pair : allocator_dumps) {
+    const std::string& dump_name = pair.first;
+    if (dump_name.find("http_cache") == std::string::npos)
+      continue;
+    did_dump = true;
+  }
+  EXPECT_TRUE(did_dump);
+}
+
 }  // namespace net