Add support for light dumps in SkTraceMemoryDump interface.

include/core/SkTraceMemoryDump.h

Index: include/core/SkTraceMemoryDump.h
diff --git a/include/core/SkTraceMemoryDump.h b/include/core/SkTraceMemoryDump.h
index d7c565f5707b1ed455b6f1d0be5471636f1a38c3..665f50c51dabd5510d77004cccdef899673b0a62 100644
--- a/include/core/SkTraceMemoryDump.h
+++ b/include/core/SkTraceMemoryDump.h
@@ -20,6 +20,16 @@ class SkDiscardableMemory;
 class SK_API SkTraceMemoryDump {
 public:
     /**
+     * Enum of bit fields to specify the requested details for the dump from the Skia objects.
+     */
+    enum RequestedDetails {
+        kMemoryTotals = 1 << 0,
+        kMallocDetails = 1 << 1,
+        kDiscardableDetails = 1 << 2,
+        kGpuMemoryDetails = 1 << 3
+    };
+
+    /**
      *  Appends a new memory dump (i.e. a row) to the trace memory infrastructure.
      *  If dumpName does not exist yet, a new one is created. Otherwise, a new column is appended to
      *  the previously created dump.
@@ -55,6 +65,13 @@ public:
         const char* dumpName,
         const SkDiscardableMemory& discardableMemoryObject) = 0;
 
+    /**
+     * Returns a bit mask of RequestedDetails enum. The embedder can request only the details
+       required in the dump. It is expected that the skia objects can add extra details if one mask
+       field is related to the other.
+     */
+    virtual uint32_t getRequestedDetails() const = 0;
+
 protected:
     virtual ~SkTraceMemoryDump() { }
 };