Bug 707800. Rename SAMPLE_CHECKPOINT to SAMPLE_LABEL. r=bgirard

Checkpoint was never a good name.

toolkit/xre/nsAppRunner.cpp

@@ -2618,7 +2618,7 @@ XRE_main(int argc, char* argv[], const nsXREAppData* aAppData)
 {
   NS_TIME_FUNCTION;
   SAMPLER_INIT();
-  SAMPLE_CHECKPOINT("Startup", "XRE_Main");
+  SAMPLE_LABEL("Startup", "XRE_Main");
 
   StartupTimeline::Record(StartupTimeline::MAIN);
 

tools/profiler/sampler.h

@@ -97,7 +97,7 @@
 #define SAMPLER_GET_PROFILE() NULL
 #define SAMPLER_RESPONSIVENESS(time) NULL
 #define SAMPLER_GET_RESPONSIVENESS() NULL
-#define SAMPLE_CHECKPOINT(name_space, info)
+#define SAMPLE_LABEL(name_space, info)
 #define SAMPLE_MARKER(info)
 
 // Redefine the macros for platforms where SPS is supported.

tools/profiler/sps/sps_sampler.h

@@ -57,7 +57,7 @@ extern pthread_key_t pkey_stack;
 #define SAMPLER_GET_RESPONSIVENESS() mozilla_sampler_get_responsiveness()
 #define SAMPLER_SAVE() mozilla_sampler_save();
 #define SAMPLER_GET_PROFILE() mozilla_sampler_get_profile();
-#define SAMPLE_CHECKPOINT(name_space, info) mozilla::SamplerStackFrameRAII only_one_sampleraii_per_scope(FULLFUNCTION, name_space "::" info);
+#define SAMPLE_LABEL(name_space, info) mozilla::SamplerStackFrameRAII only_one_sampleraii_per_scope(FULLFUNCTION, name_space "::" info);
 #define SAMPLE_MARKER(info) mozilla_sampler_add_marker(info);
 
 // STORE_SEQUENCER: Because signals can interrupt our profile modification