Trace whether RenderEngine is in a protected context or not

Note: this track will not appear when protected content is not supported
by the device, which is an intentional signal.

Bug: N/A
Flag: EXEMPT trivial debug tracing
Test: presubmit
Change-Id: I60075590a0bd218b207bc9fe6d523b7c095355f9

Author: nscobie

libs/renderengine/skia/SkiaRenderEngine.cpp

@@ -347,6 +347,7 @@ void SkiaRenderEngine::useProtectedContext(bool useProtectedContext) {
     if (useProtectedContextImpl(
             useProtectedContext ? GrProtected::kYes : GrProtected::kNo)) {
         mInProtectedContext = useProtectedContext;
+        SFTRACE_INT("RE inProtectedContext", mInProtectedContext);
         // given that we are sharing the same thread between two contexts we need to
         // make sure that the thread state is reset when switching between the two.
         if (getActiveContext()) {