[Android][Mac] Enable spellcheck caching on Android and Mac platforms.

components/spellcheck/renderer/spellcheck_provider.cc

Index: components/spellcheck/renderer/spellcheck_provider.cc
diff --git a/components/spellcheck/renderer/spellcheck_provider.cc b/components/spellcheck/renderer/spellcheck_provider.cc
index 591f26324528ba5e260bc87ec1b65689a39e8390..f52fe596705c94e675d860375170502247e45779 100644
--- a/components/spellcheck/renderer/spellcheck_provider.cc
+++ b/components/spellcheck/renderer/spellcheck_provider.cc
@@ -260,9 +260,9 @@ void SpellCheckProvider::OnRespondTextCheck(
                                          &textcheck_results);
   completion->didFinishCheckingText(textcheck_results);
 
-  // TODO(groby): Add request caching once OSX reports back original request.
-  // (cf. SpellCheckProvider::OnRespondSpellingService)
   // Cache the request and the converted results.
+  last_request_ = line;

[groby-ooo-7-16, 2016/09/09 22:41:38]

Did you verify OSX actually returns the original request? Quick glance at the
code seems to confirm that, but I've not looked in depth.

[timvolodine, 2016/09/12 15:31:39]

Yes, tested this on Mac OS X, it does return the "line" properly, and caching
appears to work.

+  last_results_.swap(textcheck_results);
 }
 
 void SpellCheckProvider::OnToggleSpellPanel(bool is_currently_visible) {