define USE_ANGLE for pixel 6

For the context mentioned in go/angle-gles, the CL enables the option
to USE_ANGLE, and it's default to false.  Later this flag will be used
in the ANGLE lunch targets.

Test: manually build bluejay_angle and test on a device

Change-Id: I5fcbb32f37a4891c82989502c43da9226dca8b38
Bug: 266433747

device.mk

@@ -182,6 +182,9 @@ USES_GAUDIO := true
 # Must match BOARD_USES_SWIFTSHADER in BoardConfig.mk
 USE_SWIFTSHADER := false
 
+# by default, USE_ANGLE is false
+USE_ANGLE ?= false
+
 # HWUI
 TARGET_USES_VULKAN = true
 
@@ -217,6 +220,13 @@ PRODUCT_PACKAGES += \
 	libGLESv2_swiftshader
 endif
 
+ifeq ($(USE_ANGLE),true)
+PRODUCT_PACKAGES += \
+	libEGL_angle \
+	libGLESv1_CM_angle \
+	libGLESv2_angle
+endif
+
 PRODUCT_COPY_FILES += \
 	frameworks/native/data/etc/android.hardware.opengles.aep.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.opengles.aep.xml \
 	frameworks/native/data/etc/android.hardware.vulkan.version-1_3.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.vulkan.version.xml \
@@ -228,6 +238,10 @@ PRODUCT_COPY_FILES += \
 ifeq ($(USE_SWIFTSHADER),true)
 PRODUCT_VENDOR_PROPERTIES += \
 	ro.hardware.egl = swiftshader
+else ifeq ($(USE_ANGLE),true)
+PRODUCT_VENDOR_PROPERTIES += \
+	ro.hardware.egl = angle \
+	ro.hardware.egl_legacy = mali
 else
 PRODUCT_VENDOR_PROPERTIES += \
 	ro.hardware.egl = mali