Addresses further review comments from ag/8000041

Including:
 - An API to opt out of Int/StringDefs generation on per-field basis
 - A way to customize Builder
 - Non-optional fields are passed in Builder constructor
 - Various adjustments to SampleDataclass examples, as requested

Test: . $ANDROID_BUILD_TOP/frameworks/base/tests/Codegen/runTest.sh
Change-Id: I32d2eec52f05d505ff07779d923e4793d3036579
diff --git a/tests/Codegen/runTest.sh b/tests/Codegen/runTest.sh
index bc1aae0..614cbb7 100755
--- a/tests/Codegen/runTest.sh
+++ b/tests/Codegen/runTest.sh
@@ -12,6 +12,7 @@
 
     header_and_eval m -j16 codegen_cli && \
         header_and_eval codegen $ANDROID_BUILD_TOP/frameworks/base/tests/Codegen/src/com/android/codegentest/SampleDataClass.java && \
+        header_and_eval codegen $ANDROID_BUILD_TOP/frameworks/base/tests/Codegen/src/com/android/codegentest/SampleWithCustomBuilder.java && \
         cd $ANDROID_BUILD_TOP &&
         header_and_eval mmma -j16 frameworks/base/tests/Codegen && \
         header_and_eval adb install -r -t $ANDROID_PRODUCT_OUT/testcases/CodegenTests/arm64/CodegenTests.apk && \