Add calculation of derived features for distillable page model

components/test/data/dom_distiller/derived_features.json

Index: components/test/data/dom_distiller/derived_features.json
diff --git a/components/test/data/dom_distiller/derived_features.json b/components/test/data/dom_distiller/derived_features.json
new file mode 100644
index 0000000000000000000000000000000000000000..40071b330b9705a0d962698b457773ea58f89ac0
--- /dev/null
+++ b/components/test/data/dom_distiller/derived_features.json
@@ -0,0 +1,194 @@
+[
+ {
+  "url": "https://zh-tw.facebook.com/permalink.php", 
+  "index": 0, 
+  "features": [
+   "opengraph", 
+   false, 
+   "forum", 
+   false, 
+   "index", 
+   false, 
+   "view", 
+   false, 
+   "asp", 
+   false, 
+   "phpbb", 
+   false, 
+   "php", 
+   true, 
+   "pathlength", 
+   14, 
+   "domain", 
+   false, 
+   "pathcomponents", 
+   1, 
+   "slugdetector", 
+   1, 
+   "pathnumbers", 
+   0, 
+   "lastSegmentLength", 
+   13, 
+   "formcount", 
+   1, 
+   "anchorcount", 
+   26, 
+   "elementcount", 
+   120, 
+   "anchorratio", 
+   0.21666666666666667, 
+   "innertextlength", 
+   492, 
+   "textcontentlength", 
+   12832, 
+   "innerhtmllength", 
+   19715, 
+   "innertextlengthratio", 
+   0.024955617550088766, 
+   "textcontentlengthratio", 
+   0.6508749682982501, 
+   "innertexttextcontentlengthratio", 
+   0.03834164588528678, 
+   "innertextwordcount", 
+   5, 
+   "textcontentwordcount", 
+   1470, 
+   "innerhtmlwordcount", 
+   2313, 
+   "innertextwordcountratio", 
+   0.00216169476869866, 
+   "textcontentwordcountratio", 
+   0.6355382619974059, 
+   "innertexttextcontentwordcountratio", 
+   0.003401360544217687
+  ]
+ }, 
+ {
+  "url": "https://zb.getitfree.us/myaccount/survey.html", 
+  "index": 1, 
+  "features": [
+   "opengraph", 
+   false, 
+   "forum", 
+   false, 
+   "index", 
+   false, 
+   "view", 
+   false, 
+   "asp", 
+   false, 
+   "phpbb", 
+   false, 
+   "php", 
+   false, 
+   "pathlength", 
+   22, 
+   "domain", 
+   false, 
+   "pathcomponents", 
+   2, 
+   "slugdetector", 
+   1, 
+   "pathnumbers", 
+   0, 
+   "lastSegmentLength", 
+   11, 
+   "formcount", 
+   0, 
+   "anchorcount", 
+   5, 
+   "elementcount", 
+   92, 
+   "anchorratio", 
+   0.05434782608695652, 
+   "innertextlength", 
+   1137, 
+   "textcontentlength", 
+   25037, 
+   "innerhtmllength", 
+   33602, 
+   "innertextlengthratio", 
+   0.03383727159097673, 
+   "textcontentlengthratio", 
+   0.7451044580679721, 
+   "innertexttextcontentlengthratio", 
+   0.045412789072173186, 
+   "innertextwordcount", 
+   181, 
+   "textcontentwordcount", 
+   2811, 
+   "innerhtmlwordcount", 
+   3926, 
+   "innertextwordcountratio", 
+   0.04610290371879776, 
+   "textcontentwordcountratio", 
+   0.7159959246051961, 
+   "innertexttextcontentwordcountratio", 
+   0.06438989683386695
+  ]
+ }, 
+ {
+  "url": "https://yande.re/pool", 
+  "index": 2, 
+  "features": [
+   "opengraph", 
+   false, 
+   "forum", 
+   false, 
+   "index", 
+   false, 
+   "view", 
+   false, 
+   "asp", 
+   false, 
+   "phpbb", 
+   false, 
+   "php", 
+   false, 
+   "pathlength", 
+   5, 
+   "domain", 
+   false, 
+   "pathcomponents", 
+   1, 
+   "slugdetector", 
+   0, 
+   "pathnumbers", 
+   0, 
+   "lastSegmentLength", 
+   4, 
+   "formcount", 
+   10, 
+   "anchorcount", 
+   112, 
+   "elementcount", 
+   492, 
+   "anchorratio", 
+   0.22764227642276422, 
+   "innertextlength", 
+   1676, 
+   "textcontentlength", 
+   41089, 
+   "innerhtmllength", 
+   56900, 
+   "innertextlengthratio", 
+   0.02945518453427065, 
+   "textcontentlengthratio", 
+   0.7221265377855888, 
+   "innertexttextcontentlengthratio", 
+   0.04078950570712356, 
+   "innertextwordcount", 
+   303, 
+   "textcontentwordcount", 
+   3874, 
+   "innerhtmlwordcount", 
+   6502, 
+   "innertextwordcountratio", 
+   0.04660104583205168, 
+   "textcontentwordcountratio", 
+   0.5958166717932943, 
+   "innertexttextcontentwordcountratio", 
+   0.07821373257614868
+  ]
+ }
+]