Rename platform/wtf/ to platform/newwtf/.

third_party/WebKit/Source/platform/newwtf/README.md

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+# platform/newwtf (will become platform/wtf eventually)
+
+This is a temporary location where all files under Source/wtf/ will be moved
+eventually. For details about WTF relocation project, see
+[the proposal](https://docs.google.com/document/d/1shS1IZe__auYxjm9FhPbTY2P01FbNTMYRh-nen5gkDo/edit?usp=sharing)
+and
+[the design doc](https://docs.google.com/document/d/1JK26H-1-cD9-s9QLvEfY55H2kgSxRFNPLfjs049Us5w/edit?usp=sharing).
+You can see
+[bug 691465](https://bugs.chromium.org/p/chromium/issues/detail?id=691465)
+for the project's status.
+
+During the project, files in wtf/ are moved to platform/newwtf/ incrementally,
+and redirection headers will be placed in wtf/. So nothing should break in the
+meantime. You can continue including WTF headers like `#include "wtf/Xxx.h"`
+till the next announcement in blink-dev.
+
+Why "new" wtf? We initially named this directory platform/wtf/, but it turned
+out this would cause a warning on win-clang due to MSVC-specific #include
+search order. Basically, we can't have "platform/wtf/Foo.h" and "wtf/Foo.h" at
+the same time, since `#include "wtf/Foo.h"` may imply platform/wtf/Foo.h
+depending on the context. We don't want to turn off this warning Blink-wide,
+and that's why we have platform/newwtf/.
+
+platform/newwtf/ will be renamed to platform/wtf/ after we get rid of wtf/
+completely.