Keep two empty lines between declarations for cpp files

src/runtime.cc

Index: src/runtime.cc
===================================================================
--- src/runtime.cc	(revision 15486)
+++ src/runtime.cc	(working copy)
@@ -4068,6 +4068,7 @@
   return -1;
 }
 
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_StringLastIndexOf) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 3);
@@ -4789,6 +4790,7 @@
   return isolate->heap()->undefined_value();
 }
 
+
 // Implements part of 8.12.9 DefineOwnProperty.
 // There are 3 cases that lead here:
 // Step 4a - define a new data property.
@@ -7463,6 +7465,7 @@
   return isolate->transcendental_cache()->Get(TranscendentalCache::LOG, x);
 }
 
+
 // Slow version of Math.pow.  We check for fast paths for special cases.
 // Used if SSE2/VFP3 is not available.
 RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_pow) {
@@ -7485,6 +7488,7 @@
   return isolate->heap()->AllocateHeapNumber(result);
 }
 
+
 // Fast version of Math.pow if we know that y is not an integer and y is not
 // -0.5 or 0.5.  Used as slow case from full codegen.
 RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_pow_cfunction) {
@@ -8852,6 +8856,7 @@
   MaybeObject* y;
 };
 
+
 static inline ObjectPair MakePair(MaybeObject* x, MaybeObject* y) {
   ObjectPair result = {x, y};
   // Pointers x and y returned in rax and rdx, in AMD-x64-abi.
@@ -10233,6 +10238,7 @@
   return string;
 }
 
+
 // Moves all own elements of an object, that are below a limit, to positions
 // starting at zero. All undefined values are placed after non-undefined values,
 // and are followed by non-existing element. Does not change the length
@@ -11850,6 +11856,7 @@
   return *isolate->factory()->NewJSArrayWithElements(details);
 }
 
+
 // Return an array with scope details
 // args[0]: number: break id
 // args[1]: number: frame index
@@ -12956,6 +12963,7 @@
   return counter;
 }
 
+
 // For a script finds all SharedFunctionInfo's in the heap that points
 // to this script. Returns JSArray of SharedFunctionInfo wrapped
 // in OpaqueReferences.
@@ -13001,6 +13009,7 @@
   return *result;
 }
 
+
 // For a script calculates compilation information about all its functions.
 // The script source is explicitly specified by the second argument.
 // The source of the actual script is not used, however it is important that
@@ -13027,6 +13036,7 @@
   return result;
 }
 
+
 // Changes the source of the script to a new_source.
 // If old_script_name is provided (i.e. is a String), also creates a copy of
 // the script with its original source and sends notification to debugger.
@@ -13074,6 +13084,7 @@
   return LiveEdit::ReplaceFunctionCode(new_compile_info, shared_info);
 }
 
+
 // Connects SharedFunctionInfo to another script.
 RUNTIME_FUNCTION(MaybeObject*, Runtime_LiveEditFunctionSetScript) {
   HandleScope scope(isolate);
@@ -13148,6 +13159,7 @@
   return *LiveEdit::CheckAndDropActivations(shared_array, do_drop);
 }
 
+
 // Compares 2 strings line-by-line, then token-wise and returns diff in form
 // of JSArray of triplets (pos1, pos1_end, pos2_end) describing list
 // of diff chunks.