[tracing] Add WebCache memory usage in Blink to chrome://tracing

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index d743fffac4636fee02a2845e2dc1a113205cf13d..a88969412cb883d3bdf85304e567c001f212e881 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -35,6 +35,7 @@
 #include "blink/public/resources/grit/blink_resources.h"
 #include "components/mime_util/mime_util.h"
 #include "components/scheduler/child/webthread_impl_for_worker_scheduler.h"
+#include "components/web_cache/renderer/web_cache_memory_dump_provider.h"
 #include "content/app/resources/grit/content_resources.h"
 #include "content/app/strings/grit/content_strings.h"
 #include "content/child/background_sync/background_sync_provider.h"
@@ -461,6 +462,10 @@ void BlinkPlatformImpl::InternalInit() {
         ChildThreadImpl::current()->service_registry()));
     sync_provider_.reset(new BackgroundSyncProvider(
         ChildThreadImpl::current()->service_registry()));
+
+    base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
+        web_cache::WebCacheMemoryDumpProvider::GetInstance(),
+        main_thread_task_runner_);
   }
 }
 
@@ -470,6 +475,8 @@ void BlinkPlatformImpl::UpdateWebThreadTLS(blink::WebThread* thread) {
 }
 
 BlinkPlatformImpl::~BlinkPlatformImpl() {
+  base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
+      web_cache::WebCacheMemoryDumpProvider::GetInstance());
 }
 
 WebURLLoader* BlinkPlatformImpl::createURLLoader() {