Implement Just-In-Time Flash updates.

components/component_updater/component_updater_service.cc

Index: components/component_updater/component_updater_service.cc
diff --git a/components/component_updater/component_updater_service.cc b/components/component_updater/component_updater_service.cc
index ab4ad19a24074eb33c711eeaa958a8fb4927f8cf..24d7ceb376e42c37a5e5915fd8763b935d51d5ab 100644
--- a/components/component_updater/component_updater_service.cc
+++ b/components/component_updater/component_updater_service.cc
@@ -21,6 +21,7 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_checker.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ -49,6 +50,11 @@ enum UpdateType {
 
 namespace component_updater {
 
+ComponentInfo::ComponentInfo() {
+}
+ComponentInfo::~ComponentInfo() {
+}
+
 CrxUpdateService::CrxUpdateService(
     const scoped_refptr<Configurator>& config,
     const scoped_refptr<UpdateClient>& update_client)
@@ -122,6 +128,8 @@ bool CrxUpdateService::RegisterComponent(const CrxComponent& component) {
 
   components_.insert(std::make_pair(id, component));
   components_order_.push_back(id);
+  for (const auto& mime_type : component.handled_mime_types)
+    component_ids_by_mime_type_[mime_type] = id;
 
   // Create an initial state for this component. The state is mutated in
   // response to events from the UpdateClient instance.
@@ -185,6 +193,21 @@ std::vector<std::string> CrxUpdateService::GetComponentIDs() const {
   return ids;
 }
 
+bool CrxUpdateService::GetComponentForMimeType(const std::string& mime_type,
+                                               ComponentInfo* info) const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  const auto it = component_ids_by_mime_type_.find(mime_type);
+  if (it == component_ids_by_mime_type_.end())
+    return false;
+  const auto component = GetComponent(it->second);
+  if (component == NULL)

[Bernhard Bauer, 2016/07/28 10:25:10]

nullptr :) Or just directly use it in the check.

[waffles, 2016/07/28 20:06:27]

Done.

+    return false;
+  info->id = GetCrxComponentID(*component);
+  base::UTF8ToUTF16(component->name.c_str(), component->name.size(),

[Bernhard Bauer, 2016/07/28 10:25:10]

I would use the version of UTF8ToUTF16 that takes a single StringPiece and
returns the UTF16 string.

[waffles, 2016/07/28 20:06:27]

Done.

+                    &info->name);
+  return true;
+}
+
 OnDemandUpdater& CrxUpdateService::GetOnDemandUpdater() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return *this;