Distinguish # apex and # systemapi symbols

Previously, the symbol tag `# apex` was treated the same as `#
systemapi`. With this CL, they have different meanings.

`# systemapi`: APIs that are defined in the platform (the non-updatable
part), and are exposed to unbundled system components like APEX

`# apex`: APIs that are defined in the APEX and are exposed to the
platform or other APEXes

Bug: 239274367
Test: m
Change-Id: I0484ea349656dbbd337e5fe3a5970f0ad275b807
diff --git a/cc/symbolfile/__init__.py b/cc/symbolfile/__init__.py
index c5147d1..471a12f 100644
--- a/cc/symbolfile/__init__.py
+++ b/cc/symbolfile/__init__.py
@@ -78,12 +78,17 @@
     @property
     def has_mode_tags(self) -> bool:
         """Returns True if any mode tags (apex, llndk, etc) are set."""
-        return self.has_apex_tags or self.has_llndk_tags
+        return self.has_apex_tags or self.has_llndk_tags or self.has_systemapi_tags
 
     @property
     def has_apex_tags(self) -> bool:
         """Returns True if any APEX tags are set."""
-        return 'apex' in self.tags or 'systemapi' in self.tags
+        return 'apex' in self.tags
+
+    @property
+    def has_systemapi_tags(self) -> bool:
+        """Returns True if any APEX tags are set."""
+        return 'systemapi' in self.tags
 
     @property
     def has_llndk_tags(self) -> bool:
@@ -203,11 +208,12 @@
     symbol should be omitted or not
     """
 
-    def __init__(self, arch: Arch, api: int, llndk: bool = False, apex: bool = False):
+    def __init__(self, arch: Arch, api: int, llndk: bool = False, apex: bool = False, systemapi: bool = False):
         self.arch = arch
         self.api = api
         self.llndk = llndk
         self.apex = apex
+        self.systemapi = systemapi
 
     def _should_omit_tags(self, tags: Tags) -> bool:
         """Returns True if the tagged object should be omitted.
@@ -219,12 +225,13 @@
         # default behavior because all NDK symbols are implicitly available to
         # APEX and LLNDK.
         if tags.has_mode_tags:
-            if not self.apex and not self.llndk:
-                return True
-            if self.apex and not tags.has_apex_tags:
-                return True
-            if self.llndk and not tags.has_llndk_tags:
-                return True
+            if self.apex and tags.has_apex_tags:
+                return False
+            if self.llndk and tags.has_llndk_tags:
+                return False
+            if self.systemapi and tags.has_systemapi_tags:
+                return False
+            return True
         if not symbol_in_arch(tags, self.arch):
             return True
         if not symbol_in_api(tags, self.arch, self.api):
diff --git a/cc/symbolfile/test_symbolfile.py b/cc/symbolfile/test_symbolfile.py
index 0060a74..e17a8d0 100644
--- a/cc/symbolfile/test_symbolfile.py
+++ b/cc/symbolfile/test_symbolfile.py
@@ -246,24 +246,30 @@
         v = self.version
         v_apex = copy(v)
         v_apex.tags = Tags.from_strs(['apex'])
+        v_systemapi = copy(v)
+        v_systemapi.tags = Tags.from_strs(['systemapi'])
 
         self.assertOmit(f, v_apex)
 
         f.apex = True
         self.assertInclude(f, v)
         self.assertInclude(f, v_apex)
+        self.assertOmit(f, v_systemapi)
 
     def test_omit_systemapi(self) -> None:
         f = self.filter
         v = self.version
+        v_apex = copy(v)
+        v_apex.tags = Tags.from_strs(['apex'])
         v_systemapi = copy(v)
         v_systemapi.tags = Tags.from_strs(['systemapi'])
 
         self.assertOmit(f, v_systemapi)
 
-        f.apex = True
+        f.systemapi = True
         self.assertInclude(f, v)
         self.assertInclude(f, v_systemapi)
+        self.assertOmit(f, v_apex)
 
     def test_omit_arch(self) -> None:
         f_arm = self.filter
@@ -321,22 +327,38 @@
 
         s_none = Symbol('foo', Tags())
         s_apex = Symbol('foo', Tags.from_strs(['apex']))
+        s_systemapi = Symbol('foo', Tags.from_strs(['systemapi']))
 
         self.assertOmit(f_none, s_apex)
         self.assertInclude(f_apex, s_none)
         self.assertInclude(f_apex, s_apex)
+        self.assertOmit(f_apex, s_systemapi)
 
     def test_omit_systemapi(self) -> None:
         f_none = self.filter
         f_systemapi = copy(f_none)
-        f_systemapi.apex = True
+        f_systemapi.systemapi = True
 
         s_none = Symbol('foo', Tags())
+        s_apex = Symbol('foo', Tags.from_strs(['apex']))
         s_systemapi = Symbol('foo', Tags.from_strs(['systemapi']))
 
         self.assertOmit(f_none, s_systemapi)
         self.assertInclude(f_systemapi, s_none)
         self.assertInclude(f_systemapi, s_systemapi)
+        self.assertOmit(f_systemapi, s_apex)
+
+    def test_omit_apex_and_systemapi(self) -> None:
+        f = self.filter
+        f.systemapi = True
+        f.apex = True
+
+        s_none = Symbol('foo', Tags())
+        s_apex = Symbol('foo', Tags.from_strs(['apex']))
+        s_systemapi = Symbol('foo', Tags.from_strs(['systemapi']))
+        self.assertInclude(f, s_none)
+        self.assertInclude(f, s_apex)
+        self.assertInclude(f, s_systemapi)
 
     def test_omit_arch(self) -> None:
         f_arm = self.filter