[Mac] Enable AppNap for renderers

content/common/mac/app_nap_activity.mm

Index: content/common/mac/app_nap_activity.mm
diff --git a/content/common/mac/app_nap_activity.mm b/content/common/mac/app_nap_activity.mm
index d2c82e80a8687d31ee4bbf1d4df96694d84facaf..1e09ddd3f0da0d2ded6ff213af7b084936014fd4 100644
--- a/content/common/mac/app_nap_activity.mm
+++ b/content/common/mac/app_nap_activity.mm
@@ -8,6 +8,12 @@
 
 #include "base/mac/scoped_nsobject.h"
 
+extern "C" {
+void __CFRunLoopSetOptionsReason(uint64_t options,
+                                 NSString* reason,
+                                 int unused);
+}
+
 namespace content {
 
 namespace {
@@ -33,6 +39,18 @@ AppNapActivity::~AppNapActivity() {
   DCHECK(!assertion_->obj.get());
 };
 
+void AppNapActivity::InitializeAppNapSupport() {
+  // Reason strings are the same as
+  // what macOS sends in the corresponding call.
+  //
+  // Normally happens during launch services check-in.
+  __CFRunLoopSetOptionsReason(
+      1, @"Finished checking in as application - waiting for events", 0);
+  // Normally happens in a dispatch_once in the NSApplication event loop.
+  __CFRunLoopSetOptionsReason(
+      0x3b000000, @"Finished delay after app launch and bundle check", 0);

[shrike, 2017/06/02 19:57:53]

Can 0x3b000000 be defined as a constant with a reasonably descriptive name, or
is this a completely magic number?

[lgrey, 2017/06/05 14:49:43]

It's magic to us, unfortunately (as is the "1" in the previous call)
https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.10.sdk/System/Li...

[shrike, 2017/06/05 15:29:36]

So is it an "or" of NSActivity flags? If so, can you replace the naked magic
number with an or of those flags?

+}
+
 void AppNapActivity::Begin() {
   DCHECK(!assertion_->obj.get());
   id assertion =