DevToolsNetworkController: support "limit throughput" network condition.

chrome/browser/devtools/devtools_network_controller.h

Index: chrome/browser/devtools/devtools_network_controller.h
diff --git a/chrome/browser/devtools/devtools_network_controller.h b/chrome/browser/devtools/devtools_network_controller.h
index f057412e5a23be36d92438d7e3b9c46115cb5ec1..c9f46f15ab24597f7014fda2c14e5816f5e67ed4 100644
--- a/chrome/browser/devtools/devtools_network_controller.h
+++ b/chrome/browser/devtools/devtools_network_controller.h
@@ -13,12 +13,18 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
+#include "base/timer/timer.h"
 
 class DevToolsNetworkConditions;
 class DevToolsNetworkTransaction;
 class GURL;
 class Profile;
 
+namespace base {
+class TimeDelta;
+class TimeTicks;
+}
+
 namespace content {
 class ResourceContext;
 }
@@ -31,6 +37,10 @@ namespace test {
 class DevToolsNetworkControllerHelper;
 }
 
+namespace {
+struct Throttle;
+}
+
 // DevToolsNetworkController tracks DevToolsNetworkTransactions.
 class DevToolsNetworkController {
 
@@ -49,6 +59,9 @@ class DevToolsNetworkController {
       const scoped_refptr<DevToolsNetworkConditions> conditions);
 
   bool ShouldFail(const net::HttpRequestInfo* request);
+  bool ShouldThrottle(const net::HttpRequestInfo* request);
+  void ThrottleTransaction(DevToolsNetworkTransaction* transaction,
+                           int64_t penalty);
 
  protected:
   friend class test::DevToolsNetworkControllerHelper;
@@ -72,6 +85,19 @@ class DevToolsNetworkController {
   // Active network conditions.
   Conditions conditions_;
 
+  void UpdateThrottles();
+  void FireThrottledCallbacks();
+  void CancelThrottles();
+  void ArmTimer();
+  void OnTimer();
+
+  typedef std::vector<Throttle> Throttles;
+  Throttles throttles_;
+  base::OneShotTimer<DevToolsNetworkController> timer_;
+  base::TimeTicks offset_;
+  base::TimeDelta tick_length_;
+  uint64_t last_tick_;
+
   base::WeakPtrFactory<DevToolsNetworkController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsNetworkController);