DO NOT MERGE ANYWHERE Add manifest for ndk-r13-release.
diff --git a/default.xml b/default.xml
index 6aca87a..e0c55ef 100644
--- a/default.xml
+++ b/default.xml
@@ -4,17 +4,17 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="master"
+  <default revision="ndk-r13-release"
            remote="aosp"
            sync-j="4" />
 
   <project path="bionic" name="platform/bionic" groups="presubmit" />
   <project path="development" name="platform/development" groups="presubmit" />
   <!-- For lit.py, needed by the libc++ tests. -->
-  <project path="external/libcxx" name="platform/external/libcxx" revision="ndk" />
-  <project path="external/libcxxabi" name="platform/external/libcxxabi" revision="ndk" />
-  <project path="external/libunwind_llvm" name="platform/external/libunwind_llvm" revision="ndk" />
-  <project path="external/llvm" name="platform/external/llvm" revision="dev" />
+  <project path="external/libcxx" name="platform/external/libcxx"  />
+  <project path="external/libcxxabi" name="platform/external/libcxxabi"  />
+  <project path="external/libunwind_llvm" name="platform/external/libunwind_llvm"  />
+  <project path="external/llvm" name="platform/external/llvm"  />
   <project path="external/googletest" name="platform/external/googletest" groups="presubmit" />
   <project path="external/shaderc/glslang" name="platform/external/shaderc/glslang" groups="presubmit" />
   <project path="external/shaderc/shaderc" name="platform/external/shaderc/shaderc" groups="presubmit" />
@@ -42,7 +42,7 @@
   <project path="prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8" groups="presubmit" />
   <project path="prebuilts/gcc/linux-x86/mips/mips64el-linux-android-4.9" name="platform/prebuilts/gcc/linux-x86/mips/mips64el-linux-android-4.9" groups="presubmit,linux,mips" />
   <project path="prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9" name="platform/prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9" groups="presubmit,linux,x86" />
-  <project path="prebuilts/ndk" name="platform/prebuilts/ndk" revision="dev" groups="presubmit" />
+  <project path="prebuilts/ndk" name="platform/prebuilts/ndk"  groups="presubmit" />
   <project path="prebuilts/ninja/darwin-x86" name="platform/prebuilts/ninja/darwin-x86" />
   <project path="prebuilts/ninja/linux-x86" name="platform/prebuilts/ninja/linux-x86" groups="presubmit" />
   <project path="prebuilts/python/darwin-x86/2.7.5" name="platform/prebuilts/python/darwin-x86/2.7.5" groups="darwin" />