[tracing] Dump child processes' memory metrics in browser

chrome/test/base/tracing_browsertest.cc

Index: chrome/test/base/tracing_browsertest.cc
diff --git a/chrome/test/base/tracing_browsertest.cc b/chrome/test/base/tracing_browsertest.cc
index 1b953594314f8d2b8f431892bd20ecf82643bd95..edb7734c80d7eeb9fb95c43c66ff93337db0f875 100644
--- a/chrome/test/base/tracing_browsertest.cc
+++ b/chrome/test/base/tracing_browsertest.cc
@@ -61,12 +61,19 @@ class TracingBrowserTest : public InProcessBrowserTest {
                                       MemoryDumpManager::kTraceCategory,
                                       event_name, 10));
 
-    GURL url2("chrome://credits/");
+    // Start new processes and stop a process while tracing is enabled.

[Primiano Tucci (use gerrit), 2016/01/05 11:55:17]

I think you have other leftover of rebase conflicts here

[ssid, 2016/01/06 20:26:33]

Adding close tab to make sure renderer is recycled.

+    GURL url2("chrome://credits");
     ui_test_utils::NavigateToURLWithDisposition(
         browser(), url2, NEW_FOREGROUND_TAB,
         ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
     ASSERT_NO_FATAL_FAILURE(ExecuteJavascriptOnCurrentTab());
 
+    GURL url3("chrome://settings");
+    ui_test_utils::NavigateToURLWithDisposition(
+        browser(), url3, CURRENT_TAB,
+        ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
+    ASSERT_NO_FATAL_FAILURE(ExecuteJavascriptOnCurrentTab());
+
     EXPECT_TRUE(WaitForWatchEvent(no_timeout));
     ASSERT_TRUE(EndTracing(&json_events));