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/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index cf0043d..3f495f8 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include "DummyConsumer.h"
+
 #include <gtest/gtest.h>
 
 #include <binder/IMemory.h>
@@ -210,4 +212,20 @@
     ASSERT_EQ(1U, graphicBuffer->getGenerationNumber());
 }
 
+TEST_F(SurfaceTest, GetConsumerName) {
+    sp<IGraphicBufferProducer> producer;
+    sp<IGraphicBufferConsumer> consumer;
+    BufferQueue::createBufferQueue(&producer, &consumer);
+
+    sp<DummyConsumer> dummyConsumer(new DummyConsumer);
+    consumer->consumerConnect(dummyConsumer, false);
+    consumer->setConsumerName(String8("TestConsumer"));
+
+    sp<Surface> surface = new Surface(producer);
+    sp<ANativeWindow> window(surface);
+    native_window_api_connect(window.get(), NATIVE_WINDOW_API_CPU);
+
+    EXPECT_STREQ("TestConsumer", surface->getConsumerName().string());
+}
+
 }