Provision to start base::SimpleTestTickClock at initial ticks

chrome/browser/memory/tab_manager_web_contents_data_unittest.cc

Index: chrome/browser/memory/tab_manager_web_contents_data_unittest.cc
diff --git a/chrome/browser/memory/tab_manager_web_contents_data_unittest.cc b/chrome/browser/memory/tab_manager_web_contents_data_unittest.cc
index 0aa9e05c37bfcf19b671b7e692103346890b2c79..2c1ff8a79e1a430204bac365f90890c4553ecf83 100644
--- a/chrome/browser/memory/tab_manager_web_contents_data_unittest.cc
+++ b/chrome/browser/memory/tab_manager_web_contents_data_unittest.cc
@@ -20,7 +20,8 @@ namespace {
 
 class TabManagerWebContentsDataTest : public ChromeRenderViewHostTestHarness {
  public:
-  TabManagerWebContentsDataTest() : ChromeRenderViewHostTestHarness() {}
+  TabManagerWebContentsDataTest()
+      : ChromeRenderViewHostTestHarness(), test_clock_(base::TimeTicks()) {}
 
   void SetUp() override {
     ChromeRenderViewHostTestHarness::SetUp();