源码路径:
android/external/giflib
用到的该lib的APP：
./external/chromium_org/android_webview/build/aosp_manifest_dev.xml: <project path="external/giflib" name="platform/external/giflib" />
./external/chromium_org/android_webview/buildbot/aosp_manifest.xml: <project path="external/giflib" name="platform/external/giflib" />