aconfig: Add exported mode to aconfig Java library generation.

This commit adds a third codegen mode, _exported_, in addition to
the existing modes, production and test.

When codegen mode is _exported_, getters are generated _only_ for
flags marked as exported as well. Also the getters always look
up DeviceConfig values at runtime, and have a default value of
false.

This only implements exported mode for Java codegen, follow-up CLs
will support Rust and C++.

Test: atest aconfig.test
Bug: 311152507
Change-Id: Ie39379b40de072180e05d84c76361b24cc0e0d83
diff --git a/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template b/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template
index 933d6a7..fd2e26a 100644
--- a/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template
+++ b/tools/aconfig/templates/FakeFeatureFlagsImpl.java.template
@@ -12,11 +12,23 @@
     }
 
 {{ for item in flag_elements}}
+{{ if library_exported }}
+
+{{ if item.exported }}
     @Override
     @UnsupportedAppUsage
     public boolean {item.method_name}() \{
         return getValue(Flags.FLAG_{item.flag_name_constant_suffix});
     }
+{{ endif }}
+
+{{ else }}
+    @Override
+    @UnsupportedAppUsage
+    public boolean {item.method_name}() \{
+        return getValue(Flags.FLAG_{item.flag_name_constant_suffix});
+    }
+{{ endif }}
 {{ endfor}}
     public void setFlag(String flagName, boolean value) \{
         if (!this.mFlagMap.containsKey(flagName)) \{
diff --git a/tools/aconfig/templates/FeatureFlags.java.template b/tools/aconfig/templates/FeatureFlags.java.template
index da850ae..180f882 100644
--- a/tools/aconfig/templates/FeatureFlags.java.template
+++ b/tools/aconfig/templates/FeatureFlags.java.template
@@ -5,6 +5,15 @@
 /** @hide */
 public interface FeatureFlags \{
 {{ for item in flag_elements }}
+{{ if library_exported }}
+
+{{ if item.exported }}
+    @UnsupportedAppUsage
+    boolean {item.method_name}();
+{{ endif }}
+
+{{ else }}
+
 {{ -if not item.is_read_write }}
 {{ -if item.default_value }}
     @com.android.aconfig.annotations.AssumeTrueForR8
@@ -14,5 +23,7 @@
 {{ endif }}
     @UnsupportedAppUsage
     boolean {item.method_name}();
+
+{{ endif }}
 {{ endfor }}
 }
diff --git a/tools/aconfig/templates/FeatureFlagsImpl.java.template b/tools/aconfig/templates/FeatureFlagsImpl.java.template
index ec8822c..a15c859 100644
--- a/tools/aconfig/templates/FeatureFlagsImpl.java.template
+++ b/tools/aconfig/templates/FeatureFlagsImpl.java.template
@@ -14,9 +14,17 @@
 {{- endfor- }}
 
 {{ for flag in flag_elements }}
+{{ if library_exported }}
+{{ if flag.exported }}
+    private static boolean {flag.method_name} = false;
+{{ endif }}
+
+{{ else }}
+
 {{- if flag.is_read_write }}
     private static boolean {flag.method_name} = {flag.default_value};
 {{- endif- }}
+{{ endif }}
 {{ endfor }}
 
 {{ for namespace_with_flags in namespace_flags }}
@@ -25,10 +33,21 @@
             Properties properties = DeviceConfig.getProperties("{namespace_with_flags.namespace}");
 
             {{- for flag in namespace_with_flags.flags }}
-            {{- if flag.is_read_write }}
+            {{ if library_exported }}
+
+            {{ if flag.exported }}
+            {flag.method_name} =
+                properties.getBoolean("{flag.device_config_flag}", false);
+            {{ endif }}
+
+            {{ else }}
+
+            {{ if flag.is_read_write }}
             {flag.method_name} =
                 properties.getBoolean("{flag.device_config_flag}", {flag.default_value});
-            {{- endif- }}
+            {{ endif }}
+
+            {{ endif }}
             {{ endfor }}
         } catch (NullPointerException e) \{
             throw new RuntimeException(
@@ -46,6 +65,9 @@
 {{ endif- }}
 
 {{ for flag in flag_elements }}
+{{ if library_exported }}
+
+{{ if flag.exported }}
     @Override
     @UnsupportedAppUsage
     public boolean {flag.method_name}() \{
@@ -58,6 +80,23 @@
         return {flag.default_value};
     {{ endif- }}
     }
+{{ endif }}
+
+{{ else }}
+    @Override
+    @UnsupportedAppUsage
+    public boolean {flag.method_name}() \{
+    {{ -if flag.is_read_write }}
+        if (!{flag.device_config_namespace}_is_cached) \{
+            load_overrides_{flag.device_config_namespace}();
+        }
+        return {flag.method_name};
+    {{ else }}
+        return {flag.default_value};
+    {{ endif- }}
+    }
+{{ endif }}
+
 {{ endfor }}
 }
 {{ else }}
diff --git a/tools/aconfig/templates/Flags.java.template b/tools/aconfig/templates/Flags.java.template
index cf6604c..9f4c52f 100644
--- a/tools/aconfig/templates/Flags.java.template
+++ b/tools/aconfig/templates/Flags.java.template
@@ -6,10 +6,28 @@
 /** @hide */
 public final class Flags \{
 {{- for item in flag_elements}}
+    {{ if library_exported }}
+    {{ if item.exported }}
     /** @hide */
     public static final String FLAG_{item.flag_name_constant_suffix} = "{item.device_config_flag}";
+    {{ endif }}
+    {{ else }}
+    /** @hide */
+    public static final String FLAG_{item.flag_name_constant_suffix} = "{item.device_config_flag}";
+    {{ endif }}
 {{- endfor }}
 {{ for item in flag_elements}}
+{{ if library_exported }}
+
+{{ if item.exported }}
+    @UnsupportedAppUsage
+    public static boolean {item.method_name}() \{
+        return FEATURE_FLAGS.{item.method_name}();
+    }
+{{ endif }}
+
+{{ else }}
+
 {{ -if not item.is_read_write }}
 {{ -if item.default_value }}
     @com.android.aconfig.annotations.AssumeTrueForR8
@@ -21,6 +39,7 @@
     public static boolean {item.method_name}() \{
         return FEATURE_FLAGS.{item.method_name}();
     }
+{{ endif }}
 {{ endfor }}
 {{ -if is_test_mode }}
     public static void setFeatureFlags(FeatureFlags featureFlags) \{