Bug 788888 - Increase the default profile size to 1 million entries. r=ehsan

tools/profiler/sps_sampler.h

@@ -76,7 +76,7 @@ extern bool stack_key_initialized;
 #warning Please add support for your architecture in chromium_types.h
 #endif
 
-#define PROFILE_DEFAULT_ENTRY 100000
+#define PROFILE_DEFAULT_ENTRY 1000000
 #ifdef ANDROID
 // We use a lower frequency on Android, in order to make things work
 // more smoothly on phones.  This value can be adjusted later with