Update pdfium to 32b639de35f905a5e5559f305d9032cde5ae5c77

- Also add script to simplify future updates
- Rewrite make files. Now they match the Build.gn files better.

Build is similar to: no skia, no v8, no xfa

Bug: 27564090
Change-Id: I28a8c79fd7f71d600c85b0a4a422d18ca8f1267c
diff --git a/testing/DEPS b/testing/DEPS
new file mode 100644
index 0000000..949e928
--- /dev/null
+++ b/testing/DEPS
@@ -0,0 +1,6 @@
+include_rules = [
+  '+core/include',
+  '+fpdfsdk/include',
+  '+public',
+  '+v8',
+]