Add click button api to suggestion handler interface

Bug: 1099498
Change-Id: I7ca8fdfbb145332bdb6cda54dbf59c86f7f86104
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2279344
Commit-Queue: Jing Wang <jiwan@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785281}

chrome/browser/chromeos/input_method/emoji_suggester_unittest.cc

@@ -47,6 +47,8 @@ class TestSuggestionHandler : public SuggestionHandlerInterface {
     return false;
   }
 
+  void ClickButton(const ui::ime::AssistiveWindowButton& button) override {}
+
   bool AcceptSuggestionCandidate(int context_id,
                                  const base::string16& candidate,
                                  std::string* error) override {

chrome/browser/chromeos/input_method/input_method_engine.cc

@@ -176,6 +176,11 @@ bool InputMethodEngine::SetButtonHighlighted(
   return true;
 }
 
+void InputMethodEngine::ClickButton(
+    const ui::ime::AssistiveWindowButton& button) {
+  observer_->OnAssistiveWindowButtonClicked(button);
+}
+
 bool InputMethodEngine::AcceptSuggestionCandidate(
     int context_id,
     const base::string16& suggestion,

chrome/browser/chromeos/input_method/input_method_engine.h

@@ -127,6 +127,8 @@ class InputMethodEngine : public InputMethodEngineBase,
                             bool highlighted,
                             std::string* error) override;
 
+  void ClickButton(const ui::ime::AssistiveWindowButton& button) override;
+
   bool AcceptSuggestionCandidate(int context_id,
                                  const base::string16& candidate,
                                  std::string* error) override;

chrome/browser/chromeos/input_method/personal_info_suggester_unittest.cc

@@ -73,6 +73,8 @@ class TestSuggestionHandler : public SuggestionHandlerInterface {
     return false;
   }
 
+  void ClickButton(const ui::ime::AssistiveWindowButton& button) override {}
+
   bool SetButtonHighlighted(int context_id,
                             const ui::ime::AssistiveWindowButton& button,
                             bool highlighted,

chrome/browser/chromeos/input_method/suggestion_handler_interface.h

@@ -52,6 +52,9 @@ class SuggestionHandlerInterface {
       bool highlighted,
       std::string* error) = 0;
 
+  // Click the given button in assitive window.
+  virtual void ClickButton(const ui::ime::AssistiveWindowButton& button) = 0;
+
   virtual bool AcceptSuggestionCandidate(int context_id,
                                          const base::string16& candidate,
                                          std::string* error) = 0;