[trace processor] Add proxy power metric

Adds an android_proxy_power metric that creates a power_per_thread
table. This table contains sched slices with discharge current
estimated from device power profile associated with each slice.

Bug: 155073476
Change-Id: Ide0db3c61c38566777450e92f70b2b4ae70a457d
diff --git a/Android.bp b/Android.bp
index 886f6a3..7113233 100644
--- a/Android.bp
+++ b/Android.bp
@@ -30,6 +30,7 @@
     "src/trace_processor/metrics/android/android_mem_unagg.sql",
     "src/trace_processor/metrics/android/android_package_list.sql",
     "src/trace_processor/metrics/android/android_powrails.sql",
+    "src/trace_processor/metrics/android/android_proxy_power.sql",
     "src/trace_processor/metrics/android/android_startup.sql",
     "src/trace_processor/metrics/android/android_startup_launches.sql",
     "src/trace_processor/metrics/android/android_task_names.sql",