Create symlink to adb in home dir right before device setup.

scripts/slave/recipes/android/perf.expected/src_side_script_fails.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.perf",
       "--builder",
       "Android Nexus5 Perf (1)",
@@ skipping 181 matching lines @@
     "cmd": [
       "unzip",
       "-o",
       "[SLAVE_BUILD]/src/out/build_product.zip"
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "name": "unzip_build_product"
   },
   {
     "cmd": [
+      "python",
+      "-u",
+      "[SLAVE_BUILD]/src/build/symlink.py",
+      "-f",
+      "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools/adb",
+      "~/adb"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "create adb symlink"
+  },
+  {
+    "cmd": [
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/daemonizer.py",
       "--",
       "[SLAVE_BUILD]/src/build/android/adb_logcat_monitor.py",
       "[SLAVE_BUILD]/src/out/logcat"
     ],
     "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "spawn_logcat_monitor"
@@ skipping 503 matching lines @@
       "@@@STEP_LOG_LINE@python.inline@  os.remove(report)@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "src-side perf tests failed [StepFailure(\"1 tests failed: ['host_info']\",)]",
     "status_code": 1
   }
 ]