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This change forces everyone to re-source envsetup.sh

Change-Id: Ieb9512d5725cca26a83debf9b0480bc20e19d5ee

and put the commonly used options at the top.

  To enable SVG, edit your buildspec.mk to
  ENABLE_SVG:=true
  then
  make clean-libwebcore && make
  Some SVG functionality has been stubbed out in this checkin.
  //branches/master/android/build/buildspec.mk.default	# edit
  - add ENABLE_SVG, commented out by default
  - fix up WEBCORE_INSTRUMENTATION define while I was in there
  //branches/master/android/external/webkit/Android.mk	# edit
  - add ENABLE_SVG C define
  - add svg paths to C includes
  //branches/master/android/external/webkit/WebCore/Android.derived.mk	# edit
  - update merge tool rules
  - add svg to css property names, keywords, generated bindings
  - add svg names, element factory, wrappers
  - remove obsolete ksvgcssproperties.h
  - add XLinkNames, required by SVG
  //branches/master/android/external/webkit/WebCore/Android.mk	# edit
  - update merge tool rules
  - add svg bindings, css svg parsing, svg rendering, svg engine
  //branches/master/android/external/webkit/WebCore/config.h	# edit
  - leave ENABLE_SVG alone if it is already defined
  //branches/master/android/external/webkit/WebCore/loader/EmptyClients.h	# edit
  - add some Android extensions as empty virtuals (EmptyClients is only used by SVG)
  //branches/master/android/external/webkit/WebCore/platform/graphics/android/GraphicsContextAndroid.cpp	# edit
  //branches/master/android/external/webkit/WebCore/platform/graphics/android/PathAndroid.cpp	# edit
  - add SVG graphics porting functions. Note the FIXMEs -- some are unimplemented.
  BUG=1474412

Automated import of CL 145053