Tool added to extract network traffic annotations.

tools/traffic_annotation/auditor/README.md

Index: tools/traffic_annotation/auditor/README.md
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+# Network Traffic Annotation Auditor
+This tool runs the clang tool for extraction of Network Traffic Annotations
+from chromium source code and collects and summarizes its outputs.
+
+## Building
+`ninja -C [build directory] traffic_annotation_auditor`
+
+## Usage
+`traffic_annotation_auditor [OPTION]... [path_filter]...`
+Extracts network traffic annotations from source files. If path filter(s) are
+specified, only those directories of the source will be analyzed.
+Run `traffic_annotation_auditor --help` for options.
+
+Example:
+  `traffic_annotation_auditor --build-dir=out/Debug --summary-file=report.txt`
+
+
+## Running on Windows
+Before running the program as above, you should build COMPLETE chromium with
+clang with keeprsp switch as follows:
+1. `gn args [build_dir, e.g. out\Debug]`
+2. add `is_clang=true` to the opened text file and save and close it.
+3. `ninja -C [build_dir] -d keeprsp -k 1000`