Add SwiftShader libraries to Linux installer package.

chrome/installer/linux/common/installer.include

Index: chrome/installer/linux/common/installer.include
diff --git a/chrome/installer/linux/common/installer.include b/chrome/installer/linux/common/installer.include
index d9aaa9781726ba6ab3bd9e1ffdf6431a510bf02f..1d31a12e333ce6dff4a1736fa159962a8332e557 100644
--- a/chrome/installer/linux/common/installer.include
+++ b/chrome/installer/linux/common/installer.include
@@ -169,6 +169,13 @@ stage_install_common() {
     install -m 644 "${BUILDDIR}/libEGL.so" "${STAGEDIR}/${INSTALLDIR}/"
   fi
 
+  # SwiftShader
+  if [ -f "${BUILDDIR}/swiftshader/libEGL.so" ]; then

[mmoss, 2017/05/08 22:49:29]

Unlike the ANGLE files above, this applies to all channels? Any idea why ANGLE
doesn't apply to stable?

+    install -m 755 -d "${STAGEDIR}/${INSTALLDIR}/swiftshader/"
+    install -m 644 "${BUILDDIR}/swiftshader/libEGL.so" "${STAGEDIR}/${INSTALLDIR}/swiftshader/"
+    install -m 644 "${BUILDDIR}/swiftshader/libGLESv2.so" "${STAGEDIR}/${INSTALLDIR}/swiftshader/"
+  fi
+
   # libc++
   if [ -f "${BUILDDIR}/lib/libc++.so" ]; then
     install -m 755 -d "${STAGEDIR}/${INSTALLDIR}/lib/"