libgui/SurfaceFlinger: Add getConsumerName

Adds a getConsumerName method to IGraphicBufferProducer and Surface.
Currently, the name is cached inside of IGBP and is update on connect
and dequeueBuffer, which should be good enough for most uses.

Bug: 6667401
Change-Id: I22c7881d778e495cf8276de7bbcd769e52429915
diff --git a/include/gui/BufferQueueProducer.h b/include/gui/BufferQueueProducer.h
index afa7eb1..9754a89 100644
--- a/include/gui/BufferQueueProducer.h
+++ b/include/gui/BufferQueueProducer.h
@@ -178,6 +178,9 @@
     // See IGraphicBufferProducer::setGenerationNumber
     virtual status_t setGenerationNumber(uint32_t generationNumber);
 
+    // See IGraphicBufferProducer::getConsumerName
+    virtual String8 getConsumerName() const override;
+
 private:
     // This is required by the IBinder::DeathRecipient interface
     virtual void binderDied(const wp<IBinder>& who);