add table pregeneration script for pmetric

experimental/skpdiff/SkDiffContext.cpp

Index: experimental/skpdiff/SkDiffContext.cpp
diff --git a/experimental/skpdiff/SkDiffContext.cpp b/experimental/skpdiff/SkDiffContext.cpp
index 78a2384fea7e960f8ee4d60232ed96c80e888354..b5991273b50e1749fd46d733b1abac192de3a445 100644
--- a/experimental/skpdiff/SkDiffContext.cpp
+++ b/experimental/skpdiff/SkDiffContext.cpp
@@ -101,6 +101,7 @@ void SkDiffContext::diffDirectories(const char baselinePath[], const char testPa
     }
 
     for (int baselineIndex = 0; baselineIndex < baselineEntries.count(); baselineIndex++) {
+        SkDebugf("[%i/%i] ", baselineIndex, baselineEntries.count());
         const char* baseFilename = baselineEntries[baselineIndex].c_str();
 
         // Find the real location of each file to compare
@@ -140,6 +141,7 @@ void SkDiffContext::diffPatterns(const char baselinePattern[], const char testPa
     }
 
     for (int entryIndex = 0; entryIndex < baselineEntries.count(); entryIndex++) {
+        SkDebugf("[%i/%i] ", entryIndex, baselineEntries.count());
         const char* baselineFilename = baselineEntries[entryIndex].c_str();
         const char* testFilename     = testEntries    [entryIndex].c_str();