Reland^2: Use "gfxstream" namespace

This reverts commit d37d7c8c0cdf6b84d453cb41e358094880a8f3b5.

Reland adds in aosp/2516595 which was only built on the "full"
target and removes namespace around window methods to satisfy
MacOS build.

Bug: b/271464937
Test: android build
Test: cmake build
Test: ATP MacOS build
Change-Id: Ida36ac16f9c3b98aedd744d21c9b27e9063a8eea
diff --git a/stream-servers/apigen-codec-common/ProtocolUtils.h b/stream-servers/apigen-codec-common/ProtocolUtils.h
index 5db7515..b03db3c 100644
--- a/stream-servers/apigen-codec-common/ProtocolUtils.h
+++ b/stream-servers/apigen-codec-common/ProtocolUtils.h
@@ -8,7 +8,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-namespace emugl {
+namespace gfxstream {
 
 // A helper template to extract values form the wire protocol stream
 // and convert them to appropriate host values.
@@ -178,4 +178,4 @@
 using InputBuffer = GenericInputBuffer<>;
 using OutputBuffer = GenericOutputBuffer<>;
 
-}  // namespace emugl
+}  // namespace gfxstream