[PM] Discard policy - Change the time spent in background requirement

Bug: 1030399
Change-Id: Ia71eab69aba53f6548e48cede43bb5d29f868bc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028157
Auto-Submit: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736608}

chrome/browser/performance_manager/graph/policies/urgent_page_discarding_policy.cc

@@ -31,7 +31,7 @@ namespace {
 // Time during which non visible pages are protected from urgent discarding
 // (not on ChromeOS).
 constexpr base::TimeDelta kNonVisiblePagesUrgentProtectionTime =
-    base::TimeDelta::FromSeconds(10);
+    base::TimeDelta::FromMinutes(10);
 #endif
 
 // Time during which a tab cannot be discarded after having played audio.

chrome/browser/performance_manager/graph/policies/urgent_page_discarding_policy_unittest.cc

@@ -186,7 +186,7 @@ void UrgentPageDiscardingPolicyTest::MakePageNodeDiscardable(
   page_node->OnMainFrameNavigationCommitted(false, base::TimeTicks::Now(), 42,
                                             kUrl, "text/html");
   (*page_node->main_frame_nodes().begin())->OnNavigationCommitted(kUrl, false);
-  AdvanceClock(base::TimeDelta::FromMinutes(1));
+  AdvanceClock(base::TimeDelta::FromMinutes(10));
   EXPECT_TRUE(policy()->CanUrgentlyDiscardForTesting(page_node));
 }