Reland "Add thread checking to RunLoop, deprecate MessageLoopRunner. (patchset #4 id:20002 of https…

base/run_loop.cc

Index: base/run_loop.cc
diff --git a/base/run_loop.cc b/base/run_loop.cc
index a2322f849582c3b22cc78b9c9980b3fd8a1a92b8..6faaeee2ba323d505e1d2ad09490455953e5b3c4 100644
--- a/base/run_loop.cc
+++ b/base/run_loop.cc
@@ -25,6 +25,7 @@ RunLoop::~RunLoop() {
 }
 
 void RunLoop::Run() {
+  DCHECK(thread_checker_.CalledOnValidThread());
   if (!BeforeRun())
     return;
 
@@ -44,6 +45,7 @@ void RunLoop::RunUntilIdle() {
 }
 
 void RunLoop::Quit() {
+  DCHECK(thread_checker_.CalledOnValidThread());
   quit_called_ = true;
   if (running_ && loop_->run_loop_ == this) {
     // This is the inner-most RunLoop, so quit now.
@@ -52,6 +54,7 @@ void RunLoop::Quit() {
 }
 
 void RunLoop::QuitWhenIdle() {
+  DCHECK(thread_checker_.CalledOnValidThread());
   quit_when_idle_received_ = true;
 }