Fix build with warnings turned on.

tests/anbox/graphics/buffer_queue_tests.cpp

@@ -124,7 +124,7 @@ class TestThread final {
   // Call end_pop() to get the command's result, as well as the popped
   // buffer if it is 0.
   bool start_pop() {
-    input_.send(Request{Cmd::Pop});
+    input_.send(Request{Cmd::Pop, Buffer{}});
     return true;
   }
 
@@ -140,12 +140,12 @@ class TestThread final {
 
   // Tell the test thread to close the queue from its side.
   void do_close() {
-    input_.send(Request{Cmd::Close});
+    input_.send(Request{Cmd::Close, Buffer{}});
   }
 
   // Tell the test thread to stop after completing its current command.
   void stop() {
-    input_.send(Request{Cmd::Stop});
+    input_.send(Request{Cmd::Stop, Buffer{}});
     thread_.join();
   }
 

tests/anbox/graphics/buffered_io_stream_tests.cpp

@@ -130,10 +130,11 @@ TEST(BufferedIOStream, ReadWithNoDataAvailable) {
     }
   });
 
-  size_t size{10};
+  constexpr size_t size{10};
   std::uint8_t read_data[size] = {0x0};
-  EXPECT_NE(nullptr, stream.read(read_data, &size));
-  EXPECT_EQ(2, size);
+  size_t read = 10;
+  EXPECT_NE(nullptr, stream.read(read_data, &read));
+  EXPECT_EQ(2, read);
   EXPECT_EQ(0x12, read_data[0]);
   EXPECT_EQ(0x34, read_data[1]);