Revert of Reland: Geolocation: move from content/browser to device/

content/browser/geolocation/location_arbitrator_impl.cc

Index: content/browser/geolocation/location_arbitrator_impl.cc
diff --git a/content/browser/geolocation/location_arbitrator_impl.cc b/content/browser/geolocation/location_arbitrator_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..44d911f7aeadfb6078f4623bd193583096a9ab68
--- /dev/null
+++ b/content/browser/geolocation/location_arbitrator_impl.cc
@@ -0,0 +1,213 @@
+// 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 "content/browser/geolocation/location_arbitrator_impl.h"
+
+#include <map>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/memory/ptr_util.h"
+#include "build/build_config.h"
+#include "content/browser/geolocation/network_location_provider.h"
+#include "content/public/browser/access_token_store.h"
+#include "content/public/browser/geolocation_delegate.h"
+#include "content/public/common/content_client.h"
+#include "url/gurl.h"
+
+namespace content {
+namespace {
+
+const char* kDefaultNetworkProviderUrl =
+    "https://www.googleapis.com/geolocation/v1/geolocate";
+}  // namespace
+
+// To avoid oscillations, set this to twice the expected update interval of a
+// a GPS-type location provider (in case it misses a beat) plus a little.
+const int64_t LocationArbitratorImpl::kFixStaleTimeoutMilliseconds =
+    11 * base::Time::kMillisecondsPerSecond;
+
+LocationArbitratorImpl::LocationArbitratorImpl(
+    const LocationUpdateCallback& callback,
+    GeolocationDelegate* delegate)
+    : delegate_(delegate),
+      arbitrator_update_callback_(callback),
+      provider_update_callback_(
+          base::Bind(&LocationArbitratorImpl::OnLocationUpdate,
+                     base::Unretained(this))),
+      position_provider_(nullptr),
+      is_permission_granted_(false),
+      is_running_(false) {}
+
+LocationArbitratorImpl::~LocationArbitratorImpl() {
+}
+
+GURL LocationArbitratorImpl::DefaultNetworkProviderURL() {
+  return GURL(kDefaultNetworkProviderUrl);
+}
+
+void LocationArbitratorImpl::OnPermissionGranted() {
+  is_permission_granted_ = true;
+  for (const auto& provider : providers_)
+    provider->OnPermissionGranted();
+}
+
+void LocationArbitratorImpl::StartProviders(bool enable_high_accuracy) {
+  // Stash options as OnAccessTokenStoresLoaded has not yet been called.
+  is_running_ = true;
+  enable_high_accuracy_ = enable_high_accuracy;
+
+  if (providers_.empty()) {
+    RegisterSystemProvider();
+
+    const scoped_refptr<AccessTokenStore> access_token_store =
+        GetAccessTokenStore();
+    if (access_token_store && delegate_->UseNetworkLocationProviders()) {
+      DCHECK(DefaultNetworkProviderURL().is_valid());
+      token_store_callback_.Reset(
+          base::Bind(&LocationArbitratorImpl::OnAccessTokenStoresLoaded,
+                     base::Unretained(this)));
+      access_token_store->LoadAccessTokens(token_store_callback_.callback());
+      return;
+    }
+  }
+  DoStartProviders();
+}
+
+void LocationArbitratorImpl::DoStartProviders() {
+  if (providers_.empty()) {
+    // If no providers are available, we report an error to avoid
+    // callers waiting indefinitely for a reply.
+    Geoposition position;
+    position.error_code = Geoposition::ERROR_CODE_PERMISSION_DENIED;
+    arbitrator_update_callback_.Run(position);
+    return;
+  }
+  for (const auto& provider : providers_)
+    provider->StartProvider(enable_high_accuracy_);
+}
+
+void LocationArbitratorImpl::StopProviders() {
+  // Reset the reference location state (provider+position)
+  // so that future starts use fresh locations from
+  // the newly constructed providers.
+  position_provider_ = nullptr;
+  position_ = Geoposition();
+
+  providers_.clear();
+  is_running_ = false;
+}
+
+void LocationArbitratorImpl::OnAccessTokenStoresLoaded(
+    AccessTokenStore::AccessTokenMap access_token_map,
+    const scoped_refptr<net::URLRequestContextGetter>& context_getter) {
+  // If there are no access tokens, boot strap it with the default server URL.
+  if (access_token_map.empty())
+    access_token_map[DefaultNetworkProviderURL()];
+  for (const auto& entry : access_token_map) {
+    RegisterProvider(NewNetworkLocationProvider(
+        GetAccessTokenStore(), context_getter, entry.first, entry.second));
+  }
+  DoStartProviders();
+}
+
+void LocationArbitratorImpl::RegisterProvider(
+    std::unique_ptr<LocationProvider> provider) {
+  if (!provider)
+    return;
+  provider->SetUpdateCallback(provider_update_callback_);
+  if (is_permission_granted_)
+    provider->OnPermissionGranted();
+  providers_.push_back(std::move(provider));
+}
+
+void LocationArbitratorImpl::RegisterSystemProvider() {
+  std::unique_ptr<LocationProvider> provider =
+      delegate_->OverrideSystemLocationProvider();
+  if (!provider)
+    provider = NewSystemLocationProvider();
+  RegisterProvider(std::move(provider));
+}
+
+void LocationArbitratorImpl::OnLocationUpdate(const LocationProvider* provider,
+                                              const Geoposition& new_position) {
+  DCHECK(new_position.Validate() ||
+         new_position.error_code != Geoposition::ERROR_CODE_NONE);
+  if (!IsNewPositionBetter(position_, new_position,
+                           provider == position_provider_))
+    return;
+  position_provider_ = provider;
+  position_ = new_position;
+  arbitrator_update_callback_.Run(position_);
+}
+
+scoped_refptr<AccessTokenStore> LocationArbitratorImpl::NewAccessTokenStore() {
+  return delegate_->CreateAccessTokenStore();
+}
+
+scoped_refptr<AccessTokenStore> LocationArbitratorImpl::GetAccessTokenStore() {
+  if (!access_token_store_)
+    access_token_store_ = NewAccessTokenStore();
+  return access_token_store_;
+}
+
+std::unique_ptr<LocationProvider>
+LocationArbitratorImpl::NewNetworkLocationProvider(
+    const scoped_refptr<AccessTokenStore>& access_token_store,
+    const scoped_refptr<net::URLRequestContextGetter>& context,
+    const GURL& url,
+    const base::string16& access_token) {
+#if defined(OS_ANDROID)
+  // Android uses its own SystemLocationProvider.
+  return nullptr;
+#else
+  return base::WrapUnique(new NetworkLocationProvider(
+      access_token_store, context, url, access_token));
+#endif
+}
+
+std::unique_ptr<LocationProvider>
+LocationArbitratorImpl::NewSystemLocationProvider() {
+#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
+  return nullptr;
+#else
+  return content::NewSystemLocationProvider();
+#endif
+}
+
+base::Time LocationArbitratorImpl::GetTimeNow() const {
+  return base::Time::Now();
+}
+
+bool LocationArbitratorImpl::IsNewPositionBetter(
+    const Geoposition& old_position, const Geoposition& new_position,
+    bool from_same_provider) const {
+  // Updates location_info if it's better than what we currently have,
+  // or if it's a newer update from the same provider.
+  if (!old_position.Validate()) {
+    // Older location wasn't locked.
+    return true;
+  }
+  if (new_position.Validate()) {
+    // New location is locked, let's check if it's any better.
+    if (old_position.accuracy >= new_position.accuracy) {
+      // Accuracy is better.
+      return true;
+    } else if (from_same_provider) {
+      // Same provider, fresher location.
+      return true;
+    } else if ((GetTimeNow() - old_position.timestamp).InMilliseconds() >
+               kFixStaleTimeoutMilliseconds) {
+      // Existing fix is stale.
+      return true;
+    }
+  }
+  return false;
+}
+
+bool LocationArbitratorImpl::HasPermissionBeenGranted() const {
+  return is_permission_granted_;
+}
+
+}  // namespace content