Provide an option in bench_pictures to count pixel ram.

tools/bench_pictures_main.cpp

Index: tools/bench_pictures_main.cpp
diff --git a/tools/bench_pictures_main.cpp b/tools/bench_pictures_main.cpp
index ffcab747720e5e765cab6e06b66b2615c935d715..68eb1a6a10c3dba6ef0a4db5a6164b501857c8fa 100644
--- a/tools/bench_pictures_main.cpp
+++ b/tools/bench_pictures_main.cpp
@@ -26,6 +26,7 @@
 SkBenchLogger gLogger;
 
 // Flags used by this file, in alphabetical order.
+DEFINE_bool(countRAM, false, "Count the RAM used for bitmap pixels in each skp file");
 DECLARE_bool(deferImageDecoding);
 DEFINE_string(filter, "",
         "type:flag : Enable canvas filtering to disable a paint flag, "
@@ -164,6 +165,13 @@ static bool run_single_benchmark(const SkString& inputPath,
         return false;
     }
 
+    // Since the old picture has been deleted, all pixels should be cleared.
+    SkASSERT(gLruImageCache.getRamUsed() == 0);
+    if (FLAGS_countRAM) {
+        // Set the budget to zero, so all pixels will be kept
+        gLruImageCache.setBudget(0);
+    }
+
     bool success = false;
     SkPicture* picture;
     if (FLAGS_deferImageDecoding) {
@@ -189,6 +197,23 @@ static bool run_single_benchmark(const SkString& inputPath,
     gLogger.logProgress(result);
 
     benchmark.run(picture);
+
+    if (FLAGS_countRAM) {
+        SkDebugf("RAM used for bitmaps: ");
+        size_t bytes = gLruImageCache.getRamUsed();
+        if (bytes > 1024) {
+            size_t kb = bytes / 1024;
+            if (kb > 1024) {
+                size_t mb = kb / 1024;
+                SkDebugf("%i MB\n", mb);
+            } else {
+                SkDebugf("%i KB\n", kb);
+            }
+        } else {
+            SkDebugf("%i bytes\n", bytes);
+        }
+    }
+
     return true;
 }