Move ownership of PowerSaveBlocker from WakeLockServiceContext to WakeLockServiceImpl

device/wake_lock/public/interfaces/wake_lock_context.mojom

Index: device/wake_lock/public/interfaces/wake_lock_context.mojom
diff --git a/device/wake_lock/public/interfaces/wake_lock_context.mojom b/device/wake_lock/public/interfaces/wake_lock_context.mojom
index 24cd02f3bcd27a8841c2cdc7edd14d290596d3f3..42c084687b79a121ade1dd751f78d7835290eebf 100644
--- a/device/wake_lock/public/interfaces/wake_lock_context.mojom
+++ b/device/wake_lock/public/interfaces/wake_lock_context.mojom
@@ -6,10 +6,36 @@ module device.mojom;
 
 import "device/wake_lock/public/interfaces/wake_lock_service.mojom";
 
+// TODO(heke): Switch PowerSaveBlocker to use WakeLockType and WakeLockReason
+// below once it has no direct consumers.
+enum WakeLockType {
+    // Prevent the application from being suspended. On some platforms, apps may
+    // be suspended when they are not visible to the user. This type of block
+    // requests that the app continue to run in that case, and on all platforms
+    // prevents the system from sleeping.
+    // Example use cases: downloading a file, playing audio.
+    PreventAppSuspension = 0,
+
+    // Prevent the display from going to sleep. This also has the side effect of
+    // preventing the system from sleeping, but does not necessarily prevent the
+    // app from being suspended on some platforms if the user hides it.
+    // Example use case: playing video.
+    PreventDisplaySleep = 1,
+};
+
+enum WakeLockReason {
+    // Audio is being played.
+    ReasonAudioPlayback = 0,
+    // Video is being played.
+    ReasonVideoPlayback = 1,
+    // WakeLock for some other reason.
+    ReasonOther = 2,
+};
+
 // Context in which WakeLockService instances operate.
 interface WakeLockContext {
   // Gets a WakeLockService within this context.
-  GetWakeLock(WakeLockService& wake_lock);
+  GetWakeLock(WakeLockType type, WakeLockReason reason, string description, WakeLockService& wake_lock);
 
   // Test-only method that returns whethere a wake lock is currently active
   // within this context.