[scheduler] Add TaskQueue::Observer

content/browser/devtools/protocol/devtools_protocol_browsertest.cc

Index: content/browser/devtools/protocol/devtools_protocol_browsertest.cc
diff --git a/content/browser/devtools/protocol/devtools_protocol_browsertest.cc b/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
index d771e0e1ec8e04c94b8970a6d580ec6fdc593205..0f44ea9a4bedf276bbe8001179e39240bf0f0379 100644
--- a/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
+++ b/content/browser/devtools/protocol/devtools_protocol_browsertest.cc
@@ -1330,16 +1330,18 @@ IN_PROC_BROWSER_TEST_F(DevToolsProtocolTest, MAYBE_VirtualTimeTest) {
   params->SetString("policy", "pause");
   SendCommand("Emulation.setVirtualTimePolicy", std::move(params), true);
 
+  // TODO(scheduler-dev): Revisit timing when we have strict ordering

[Sami, 2017/04/05 13:16:51]

Can we now also enable this for Android?

[altimin, 2017/04/05 13:55:18]

Let's ask Alex when he's back.

[Sami, 2017/04/05 14:38:15]

I'm pretty sure we can -- this was the bug I was fixing with my EnqueueOrder
change. Could you turn this on here please?

[altimin, 2017/04/05 15:10:22]

I'll try it in a separate CL.

[Sami, 2017/04/05 15:16:55]

Let's do it here since this is actually the patch that fixes the test. The
trybots will tell us if I'm wrong -- at that point we can split.

[altimin, 2017/04/05 15:23:33]

Done.

+  // guarantees.
   params.reset(new base::DictionaryValue());
   params->SetString("expression",
                     "setTimeout(function(){console.log('before')}, 1000);"
-                    "setTimeout(function(){console.log('after')}, 1001);");
+                    "setTimeout(function(){console.log('after')}, 1002);");
   SendCommand("Runtime.evaluate", std::move(params), true);
 
   // Let virtual time advance for one second.
   params.reset(new base::DictionaryValue());
   params->SetString("policy", "advance");
-  params->SetInteger("budget", 1000);
+  params->SetInteger("budget", 1001);
   SendCommand("Emulation.setVirtualTimePolicy", std::move(params), true);
 
   WaitForNotification("Emulation.virtualTimeBudgetExpired");