Make BrowserTest.ThirtyFourTabs not-flaky

chrome/browser/browser_browsertest.cc

Index: chrome/browser/browser_browsertest.cc
diff --git a/chrome/browser/browser_browsertest.cc b/chrome/browser/browser_browsertest.cc
index f2098378a90026f5c0fcda42de3132b2ff944098..21750e19453c4c3049d35cd6e18116b3de09d692 100644
--- a/chrome/browser/browser_browsertest.cc
+++ b/chrome/browser/browser_browsertest.cc
@@ -5,6 +5,7 @@
 #include <string>
 
 #include "app/l10n_util.h"
+#include "base/sys_info.h"
 #include "chrome/browser/app_modal_dialog.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_process.h"
@@ -98,3 +99,26 @@ IN_PROC_BROWSER_TEST_F(BrowserTest, JavascriptAlertActivatesTab) {
   EXPECT_EQ(2, browser()->tab_count());
   EXPECT_EQ(1, browser()->selected_index());
 }
+
+// Create 34 tabs and verify that a lot of processes have been created. The
+// exact number of processes depends on the amount of memory. Previously we
+// had a hard limit of 31 processes and this test is mainly directed at
+// verifying that we don't crash when we pass this limit.
+IN_PROC_BROWSER_TEST_F(BrowserTest, ThirtyFourTabs) {
+  GURL url(ui_test_utils::GetTestUrl(L".", L"title2.html"));
+
+  // There is one initial tab.
+  for (int ix = 0; ix != 33; ++ix) {
+    browser()->AddTabWithURL(url, GURL(), PageTransition::TYPED,
+                             true, 0, false, NULL);
+  }
+  EXPECT_EQ(34, browser()->tab_count());
+
+  // See browser\renderer_host\render_process_host.cc for the algorithm to
+  // decide how many processes to create.
+  if (base::SysInfo::AmountOfPhysicalMemoryMB() >= 2048) {
+    EXPECT_GE(RenderProcessHost::size(), 24U);
+  } else {
+    EXPECT_LE(RenderProcessHost::size(), 23U);
+  }
+}