Fix the units for Pointer events

The time_stamp is supposed to be in microseconds. Previously we were using
milliseconds.

sky/shell/platform/android/org/domokit/sky/shell/PlatformViewAndroid.java

@@ -186,7 +186,7 @@ public class PlatformViewAndroid extends SurfaceView {
 
         Pointer pointer = new Pointer();
 
-        pointer.timeStamp = event.getEventTime();
+        pointer.timeStamp = event.getEventTime() * 1000; // Convert from milliseconds to microseconds.
         pointer.pointer = event.getPointerId(pointerIndex);
         pointer.type = pointerType;
         pointer.kind = PointerKind.TOUCH;

sky/shell/platform/ios/sky_surface.mm

@@ -52,7 +52,7 @@ static inline PointerTypeMapperPhase PointerTypePhaseFromUITouchPhase(
 
 static inline int64 InputEventTimestampFromNSTimeInterval(
     NSTimeInterval interval) {
-  return base::TimeDelta::FromSecondsD(interval).InMilliseconds();
+  return base::TimeDelta::FromSecondsD(interval).InMicroseconds();
 }
 
 // UITouch pointers cannot be used as touch ids (even though they remain

sky/shell/platform/mac/sky_window.mm

@@ -150,7 +150,7 @@ static inline pointer::PointerType EventTypeFromNSEventPhase(NSEventPhase phase)
   auto pointer_data = pointer::Pointer::New();
 
   pointer_data->time_stamp =
-      base::TimeDelta::FromSecondsD(event.timestamp).InMilliseconds();
+      base::TimeDelta::FromSecondsD(event.timestamp).InMicroseconds();
   pointer_data->type = EventTypeFromNSEventPhase(phase);
   pointer_data->kind = pointer::PointerKind::TOUCH;
   pointer_data->pointer = 0;

sky/shell/platform/mojo/platform_view_mojo.cc

@@ -122,9 +122,7 @@ void PlatformViewMojo::OnEvent(mojo::EventPtr event,
       if (!data)
         break;
       pointer::PointerPtr pointer = pointer::Pointer::New();
-      // TODO(abarth): Sort out the units for time_stamp.
-      // See https://github.com/domokit/mojo/issues/541
-      pointer->time_stamp = event->time_stamp / 1000;
+      pointer->time_stamp = event->time_stamp;
       pointer->pointer = data->pointer_id;
       pointer->type = GetTypeFromAction(event->action);
       pointer->kind = GetKindFromKind(data->kind);

sky/shell/shell.cc

@@ -68,8 +68,6 @@ Shell::Shell(const Settings& settings) : settings_(settings) {
   io_thread_.reset(new base::Thread("io_thread"));
   io_thread_->StartWithOptions(options);
   io_task_runner_ = io_thread_->message_loop()->task_runner();
-
-  ui_task_runner()->PostTask(FROM_HERE, base::Bind(&Engine::Init));
 }
 
 Shell::~Shell() {
@@ -91,7 +89,9 @@ void Shell::InitStandalone() {
 
 void Shell::Init(const Settings& settings) {
   base::DiscardableMemoryAllocator::SetInstance(&g_discardable.Get());
+  DCHECK(!g_shell);
   g_shell = new Shell(settings);
+  g_shell->ui_task_runner()->PostTask(FROM_HERE, base::Bind(&Engine::Init));
 }
 
 Shell& Shell::Shared() {