Interpret '?' and Ctrl-K or Ctrl-E as putting omnibox in keyword search mode for Default Search Pro…

components/omnibox/browser/shortcuts_provider.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/omnibox/browser/shortcuts_provider.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 53 matching lines @@
   }
 }
 
 void ShortcutsProvider::Start(const AutocompleteInput& input,
                               bool minimal_changes) {
   TRACE_EVENT0("omnibox", "ShortcutsProvider::Start");
   matches_.clear();
 
   if (input.from_omnibox_focus() ||
       (input.type() == metrics::OmniboxInputType::INVALID) ||
-      (input.type() == metrics::OmniboxInputType::FORCED_QUERY) ||
       input.text().empty() || !initialized_)
     return;
 
   base::TimeTicks start_time = base::TimeTicks::Now();
   GetMatches(input);
   if (input.text().length() < 6) {
     base::TimeTicks end_time = base::TimeTicks::Now();
     std::string name = "ShortcutsProvider.QueryIndexTime." +
                        base::SizeTToString(input.text().size());
     base::HistogramBase* counter = base::Histogram::FactoryGet(
@@ skipping 331 matching lines @@
   const double kMaxDecaySpeedDivisor = 5.0;
   const double kNumUsesPerDecaySpeedDivisorIncrement = 5.0;
   double decay_divisor = std::min(
       kMaxDecaySpeedDivisor,
       (shortcut.number_of_hits + kNumUsesPerDecaySpeedDivisorIncrement - 1) /
           kNumUsesPerDecaySpeedDivisorIncrement);
 
   return static_cast<int>((base_score / exp(decay_exponent / decay_divisor)) +
                           0.5);
 }