Merge "Add logcat APIs." am: e6b57e4a05 am: 0d1016edf6

Original change: https://android-review.googlesource.com/c/platform/development/+/2264282

Change-Id: I3434777bc19ef9a399db40ca425e2a2e3b967d50
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

python-packages/adb/device.py

@@ -522,3 +522,11 @@ class AndroidDevice(object):
 
     def set_prop(self, prop_name, value):
         self.shell(['setprop', prop_name, value])
+
+    def logcat(self) -> str:
+        """Returns the contents of logcat."""
+        return self._simple_call(['logcat', '-d'])
+
+    def clear_logcat(self) -> None:
+        """Clears the logcat buffer."""
+        self._simple_call(['logcat', '-c'])