Enable Gradle's incremental annotation processing always.

We haven't received any reports of this not working correctly.

RELNOTES=Gradle's incremental annotation processing is now enabled for all builds

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=258623443

java/dagger/internal/codegen/ComponentProcessor.java

@@ -16,14 +16,15 @@
 
 package dagger.internal.codegen;
 
-import static net.ltgt.gradle.incap.IncrementalAnnotationProcessorType.DYNAMIC;
+import static net.ltgt.gradle.incap.IncrementalAnnotationProcessorType.ISOLATING;
 
 import com.google.auto.common.BasicAnnotationProcessor;
 import com.google.auto.service.AutoService;
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
+import com.google.common.collect.Sets;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.errorprone.annotations.CheckReturnValue;
 import dagger.BindsInstance;
@@ -48,7 +49,7 @@
  *
  * <p>TODO(gak): give this some better documentation
  */
-@IncrementalAnnotationProcessor(DYNAMIC)
+@IncrementalAnnotationProcessor(ISOLATING)
 @AutoService(Processor.class)
 public class ComponentProcessor extends BasicAnnotationProcessor {
   private final Optional<ImmutableSet<BindingGraphPlugin>> testingPlugins;
@@ -95,13 +96,10 @@ public SourceVersion getSupportedSourceVersion() {
 
   @Override
   public Set<String> getSupportedOptions() {
-    ImmutableSet.Builder<String> options = ImmutableSet.builder();
-    options.addAll(ProcessingEnvironmentCompilerOptions.supportedOptions());
-    options.addAll(bindingGraphPlugins.allSupportedOptions());
-    if (compilerOptions.useGradleIncrementalProcessing()) {
-      options.add("org.gradle.annotation.processing.isolating");
-    }
-    return options.build();
+    return Sets.union(
+            ProcessingEnvironmentCompilerOptions.supportedOptions(),
+            bindingGraphPlugins.allSupportedOptions())
+        .immutableCopy();
   }
 
   @Override

java/dagger/internal/codegen/ProcessingEnvironmentCompilerOptions.java

@@ -183,6 +183,7 @@ private ProcessingEnvironmentCompilerOptions checkValid() {
     noLongerRecognized(EXPERIMENTAL_ANDROID_MODE);
     noLongerRecognized(FLOATING_BINDS_METHODS);
     noLongerRecognized(EXPERIMENTAL_AHEAD_OF_TIME_SUBCOMPONENTS);
+    noLongerRecognized(USE_GRADLE_INCREMENTAL_PROCESSING);
     return this;
   }