Only send <Standby> to TV on sleep when active source

Test: make, flash, let device go to sleep due to keycode_power and
energy saver mode, verify that <Standby> is only sent when mIsActiveSource is true.

Bug: 155228844
Change-Id: Ie62d60e8c4fa573aac6c08a4c1093d5f1a52d7f3

services/core/java/com/android/server/hdmi/HdmiCecLocalDevicePlayback.java

@@ -163,12 +163,13 @@ public class HdmiCecLocalDevicePlayback extends HdmiCecLocalDeviceSource {
         }
         if (mIsActiveSource) {
             mService.sendCecCommand(HdmiCecMessageBuilder.buildInactiveSource(
-                mAddress, mService.getPhysicalAddress()));
+                    mAddress, mService.getPhysicalAddress()));
         }
+        boolean wasActiveSource = mIsActiveSource;
         // Invalidate the internal active source record when goes to standby
         // This set will also update mIsActiveSource
         mService.setActiveSource(Constants.ADDR_INVALID, Constants.INVALID_PHYSICAL_ADDRESS);
-        if (initiatedByCec || !mAutoTvOff) {
+        if (initiatedByCec || !mAutoTvOff || !wasActiveSource) {
             return;
         }
         switch (standbyAction) {