Print CSS text (rather than ids) when CSS tests fail. This makes it much easier to find which test failed.
Print CSS text (rather than ids) when CSS tests fail. This makes it much easier to find which test failed.

Old failure log:

[ RUN      ] CssFilterTest.RewriteVariousCss
[0822/190921:WARNING:google_message_handler.cc(38)] CSS parsing error in http://
test.com/distilled_css_good70-inline.html
net/instaweb/rewriter/css_rewrite_test_base.cc:95: Failure
Value of: num_blocks_rewritten_->Get()
  Actual: 0
Expected: 1
distilled_css_good70-inline
net/instaweb/rewriter/css_rewrite_test_base.cc:97: Failure
Value of: num_parse_failures_->Get()
  Actual: 1
Expected: 0
distilled_css_good70-inline
...

New failure log:

[ RUN      ] CssFilterTest.RewriteVariousCss
[0825/113839:WARNING:google_message_handler.cc(38)] CSS parsing error in http://test.com/distilled_css_good70-inline.html
net/instaweb/rewriter/css_rewrite_test_base.cc:95: Failure
Value of: num_blocks_rewritten_->Get()
  Actual: 0
Expected: 1
a{_height: expression((parentNode.offsetHeight-17))}
net/instaweb/rewriter/css_rewrite_test_base.cc:97: Failure
Value of: num_parse_failures_->Get()
  Actual: 1
Expected: 0
a{_height: expression((parentNode.offsetHeight-17))}
...

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