GpuMemTracer: remove the sleep workaround

Bug: 161909227
Test: adb shell perfetto --query | grep gpu.
Test: Take a perfetto trace with android.gpumem enabled
Change-Id: Ie2a62c5a29a53fa8d93308dd2edd4968e067c537
Merged-In: Ie2a62c5a29a53fa8d93308dd2edd4968e067c537
diff --git a/services/gpuservice/tracing/GpuMemTracer.cpp b/services/gpuservice/tracing/GpuMemTracer.cpp
index c9bfa57..9e01a64 100644
--- a/services/gpuservice/tracing/GpuMemTracer.cpp
+++ b/services/gpuservice/tracing/GpuMemTracer.cpp
@@ -44,10 +44,6 @@
     mGpuMem = gpuMem;
     perfetto::TracingInitArgs args;
     args.backends = perfetto::kSystemBackend;
-    // TODO(b/160016498): Find a better way to wait for traced
-    // Sleep for 30 seconds to make sure the data source is registered only
-    // after traced starts.
-    sleep(30);
     perfetto::Tracing::Initialize(args);
     registerDataSource();
     std::thread tracerThread(&GpuMemTracer::threadLoop, this);