[Reland] Per WebViewScheduler virtual time

third_party/WebKit/public/platform/WebTaskRunner.h

Index: third_party/WebKit/public/platform/WebTaskRunner.h
diff --git a/third_party/WebKit/public/platform/WebTaskRunner.h b/third_party/WebKit/public/platform/WebTaskRunner.h
index defe4a1aedac05b2ce2dd8c4850f1455b2b3bb8d..1f714262ba1a666a8fae60bab981596703bd0830 100644
--- a/third_party/WebKit/public/platform/WebTaskRunner.h
+++ b/third_party/WebKit/public/platform/WebTaskRunner.h
@@ -37,6 +37,24 @@ public:
     // Returns a clone of the WebTaskRunner.
     virtual WebTaskRunner* clone() = 0;
 
+    // ---
+
+    // Headless Chrome virtualises time for determinism and performance (fast forwarding
+    // of timers). To make this work some parts of blink (e.g. Timers) need to use virtual
+    // time, however by default new code should use the normal non-virtual time APIs.
+
+    // Returns a double which is the number of seconds since epoch (Jan 1, 1970).
+    // This may represent either the real time, or a virtual time depending on

[Sami, 2016/02/09 21:00:28]

These two functions no longer depend on whether we're running a virtual time
task or not, right? Looks like both comments need updating.

[alex clarke (OOO till 29th), 2016/02/10 14:58:07]

Done.

+    // whether or not the system is currently running a task associated with a
+    // virtual time domain or real time domain.
+    virtual double virtualTimeSeconds() const = 0;
+
+    // Returns a microsecond resolution platform dependant time source.
+    // This may represent either the real time, or a virtual time depending on
+    // whether or not the system is currently running a task associated with a
+    // virtual time domain or real time domain.
+    virtual double monotonicallyIncreasingVirtualTimeSeconds() const = 0;
+
 #ifdef INSIDE_BLINK
     // Helpers for posting bound functions as tasks.
     typedef Function<void()> ClosureTask;