Add new README.md files.

Change-Id: I25cc3b08b2615fb2664c27871f40a9d817b11850

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+# gapii
+--
+    import "android.googlesource.com/platform/tools/gpu/gapii"
+
+Package gapii provides functions for launching and communicating with the gapii
+tracer.
+
+## Usage
+
+#### func  AdbStart
+
+```go
+func AdbStart(l log.Logger, a *adb.Action, spyport adb.Port) error
+```
+AdbStart launches an activity on an android device with the gapii tracer
+enabled. Gapii will attempt to connect back on the specified host port to write
+the trace.
+
+#### func  Capture
+
+```go
+func Capture(logger log.Logger, port int, w io.Writer, stop chan struct{}) (int64, error)
+```
+Capture opens up the specified port and then waits for a capture to be
+delivered. It copies the capture into the supplied writer.