Have SkTArray explicitly call default constructors.

include/core/SkTArray.h

Index: include/core/SkTArray.h
===================================================================
--- include/core/SkTArray.h	(revision 13896)
+++ include/core/SkTArray.h	(working copy)
@@ -53,7 +53,7 @@
 
 /** When MEM_COPY is true T will be bit copied when moved.
     When MEM_COPY is false, T will be copy constructed / destructed.
-    In all cases T's constructor will be called on allocation,
+    In all cases T will be default-initialized on allocation,
     and its destructor will be called from this object's destructor.
 */
 template <typename T, bool MEM_COPY> class SkTArray {
@@ -173,7 +173,7 @@
     bool empty() const { return !fCount; }
 
     /**
-     * Adds 1 new default-constructed T value and returns in by reference. Note
+     * Adds 1 new default-initialized T value and returns it by reference. Note
      * the reference only remains valid until the next call that adds or removes
      * elements.
      */
@@ -193,9 +193,9 @@
     }
 
     /**
-     * Allocates n more default T values, and returns the address of the start
-     * of that new range. Note: this address is only valid until the next API
-     * call made on the array that might add or remove elements.
+     * Allocates n more default-initialized T values, and returns the address of
+     * the start of that new range. Note: this address is only valid until the
+     * next API call made on the array that might add or remove elements.
      */
     T* push_back_n(int n) {
         SkASSERT(n >= 0);