Reduce the memory usage of bookmarks storage

chrome/browser/bookmarks/chrome_bookmark_client.cc

Index: chrome/browser/bookmarks/chrome_bookmark_client.cc
diff --git a/chrome/browser/bookmarks/chrome_bookmark_client.cc b/chrome/browser/bookmarks/chrome_bookmark_client.cc
index 34bb09d90925f23c31fa23502e7e03698e541a50..7bb830ea863dff754a97ff1a1e991a20fd6d21de 100644
--- a/chrome/browser/bookmarks/chrome_bookmark_client.cc
+++ b/chrome/browser/bookmarks/chrome_bookmark_client.cc
@@ -7,6 +7,7 @@
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/user_metrics.h"
+#include "base/sys_info.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
@@ -23,6 +24,11 @@
 #include "chrome/browser/android/offline_pages/offline_page_bookmark_observer.h"
 #endif
 
+namespace {
+// Optional keys present in MetaInfo maps in bookmark nodes to load in memory.
+const char* const kOptionalMetakeys[] = {"imageData", "pageData"};
+}  // namespace
+
 ChromeBookmarkClient::ChromeBookmarkClient(
     Profile* profile,
     bookmarks::ManagedBookmarkService* managed_bookmark_service)
@@ -127,3 +133,13 @@ bool ChromeBookmarkClient::CanBeEditedByUser(
              ? true
              : managed_bookmark_service_->CanBeEditedByUser(node);
 }
+
+std::vector<std::string> ChromeBookmarkClient::ExecludedMetaKeys() {
+  std::vector<std::string> optional_keys;
+  // Do not load the image and page data into memory for low-end devices.
+  if (base::SysInfo::IsLowEndDevice()) {
+    optional_keys.insert(optional_keys.end(), std::begin(kOptionalMetakeys),
+                         std::end(kOptionalMetakeys));
+  }
+  return optional_keys;
+}