Reland^2: Use "gfxstream" namespace

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

This reverts commit 0d8285efa8845f757fb2d1f0225bac0aacb02a88.

Bug: b/271464937
Test: android build
Test: cmake build
Change-Id: I7b18f854520d729153ed1e85c82e6a7f21dd752d
1 file changed