[SurfaceFlinger] Add GPU protected content support.

BUG: 35315015
Test: Test with a hacked patch.
Test: Watch Youtube movie, verifed by force GPU composition.
Change-Id: I1130c3ce7b534bfc1efefdf5a70b23311e2de944
diff --git a/services/surfaceflinger/BufferLayer.h b/services/surfaceflinger/BufferLayer.h
index 690a4e5..be16cf5 100644
--- a/services/surfaceflinger/BufferLayer.h
+++ b/services/surfaceflinger/BufferLayer.h
@@ -71,6 +71,10 @@
     // isVisible - true if this layer is visible, false otherwise
     bool isVisible() const override;
 
+    // isProtected - true if the layer may contain protected content in the
+    // GRALLOC_USAGE_PROTECTED sense.
+    bool isProtected() const override;
+
     // isFixedSize - true if content has a fixed size
     bool isFixedSize() const override;
 
@@ -149,13 +153,6 @@
 
     virtual void setHwcLayerBuffer(DisplayId displayId) = 0;
 
-    // -----------------------------------------------------------------------
-
-public:
-    // isProtected - true if the layer may contain protected content in the
-    // GRALLOC_USAGE_PROTECTED sense.
-    bool isProtected() const;
-
 protected:
     // Loads the corresponding system property once per process
     static bool latchUnsignaledBuffers();