[Android] Add context manager to record logcat during step(s).

scripts/slave/recipes/android_webview_aosp_perf.expected/basic.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.testing.master",
       "--builder",
       "TestBuilder",
@@ skipping 533 matching lines @@
       "@@@STEP_TEXT@<br/>Device Affinity: 0<br/>@@@",
       "@@@STEP_LOG_LINE@json.output@[]@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/tee.py",
-      "[SLAVE_BUILD]/src/out/Release/full_log",
+      "[SLAVE_BUILD]/src/out/Release/full_logcat",
       "--",
       "[SLAVE_BUILD]/src/build/android/adb_logcat_printer.py",
       "[SLAVE_BUILD]/src/out/logcat"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "logcat_dump"
   },
   {
     "cmd": [
       "[SLAVE_BUILD]/src/third_party/android_platform/development/scripts/stack",
       "--arch",
       "arm",
       "--more-info",
-      "[SLAVE_BUILD]/src/out/Release/full_log"
+      "[SLAVE_BUILD]/src/out/Release/full_logcat"
     ],
     "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "stack_tool_with_logcat_dump"
   },
   {
     "cmd": [
       "[SLAVE_BUILD]/src/build/android/tombstones.py",
@@ skipping 26 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.remove(report)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]