Include the host in PowerSaveBlockResourceThrottle.

This allows us to diagnose through system tools unexpected sleep prevention until a more proper UI solution (such as in bug http://crbug.com/571426) is implemented.

BUG=571250

Review URL: https://codereview.chromium.org/1546253002

Cr-Commit-Position: refs/heads/master@{#366945}

content/browser/loader/power_save_block_resource_throttle.cc

@@ -14,8 +14,9 @@ const int kPowerSaveBlockDelaySeconds = 30;
 
 }  // namespace
 
-PowerSaveBlockResourceThrottle::PowerSaveBlockResourceThrottle() {
-}
+PowerSaveBlockResourceThrottle::PowerSaveBlockResourceThrottle(
+    const std::string& host)
+    : host_(host) {}
 
 PowerSaveBlockResourceThrottle::~PowerSaveBlockResourceThrottle() {
 }
@@ -41,7 +42,7 @@ const char* PowerSaveBlockResourceThrottle::GetNameForLogging() const {
 void PowerSaveBlockResourceThrottle::ActivatePowerSaveBlocker() {
   power_save_blocker_ = PowerSaveBlocker::Create(
       PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension,
-      PowerSaveBlocker::kReasonOther, "Uploading data");
+      PowerSaveBlocker::kReasonOther, "Uploading data to " + host_);
 }
 
 }  // namespace content

content/browser/loader/power_save_block_resource_throttle.h

@@ -5,6 +5,8 @@
 #ifndef CONTENT_BROWSER_LOADER_POWER_SAVE_BLOCK_RESOURCE_THROTTLE_H_
 #define CONTENT_BROWSER_LOADER_POWER_SAVE_BLOCK_RESOURCE_THROTTLE_H_
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ -18,7 +20,7 @@ class PowerSaveBlocker;
 // This ResourceThrottle blocks power save until large upload request finishes.
 class PowerSaveBlockResourceThrottle : public ResourceThrottle {
  public:
-  PowerSaveBlockResourceThrottle();
+  explicit PowerSaveBlockResourceThrottle(const std::string& host);
   ~PowerSaveBlockResourceThrottle() override;
 
   // ResourceThrottle overrides:
@@ -29,6 +31,7 @@ class PowerSaveBlockResourceThrottle : public ResourceThrottle {
  private:
   void ActivatePowerSaveBlocker();
 
+  const std::string host_;
   base::OneShotTimer timer_;
   scoped_ptr<PowerSaveBlocker> power_save_blocker_;
 

content/browser/loader/resource_dispatcher_host_impl.cc

@@ -1594,7 +1594,8 @@ scoped_ptr<ResourceHandler> ResourceDispatcherHostImpl::AddStandardHandlers(
 
   if (request->has_upload()) {
     // Block power save while uploading data.
-    throttles.push_back(new PowerSaveBlockResourceThrottle());
+    throttles.push_back(
+        new PowerSaveBlockResourceThrottle(request->url().host()));
   }
 
   // TODO(ricea): Stop looking this up so much.