Revert "remove toString"

This reverts commit 5191880cbf3ee4d122b0d11b4945fbab0784fda7.

Reason for revert: broke flutter

Original change's description:
> remove toString
> 
> toString may have been used by obsolete debugger only
> find out if that is so
> 
> R=​brianosman@google.com,bsalomon@google.com
> 
> Docs-Preview: https://skia.org/?cl=119894
> Bug:830651
> Change-Id: I737f19b7d3fbc869bea2f443fa3b5ed7c1393ffd
> Reviewed-on: https://skia-review.googlesource.com/119894
> Commit-Queue: Cary Clark <caryclark@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,brianosman@google.com,caryclark@google.com,caryclark@skia.org

Change-Id: I9f81de6c3615ee0608bcea9081b77239b4b8816c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 830651
Reviewed-on: https://skia-review.googlesource.com/129340
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index 91510007cf..579573367f 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -633,6 +633,33 @@ void SkBitmap::validate() const {
 }
 #endif
 
+#include "SkString.h"
+void SkBitmap::toString(SkString* str) const {
+
+    static const char* gColorTypeNames[kLastEnum_SkColorType + 1] = {
+        "UNKNOWN", "A8", "565", "4444", "RGBA", "BGRA", "INDEX8",
+    };
+
+    str->appendf("bitmap: ((%d, %d) %s", this->width(), this->height(),
+                 gColorTypeNames[this->colorType()]);
+
+    str->append(" (");
+    if (this->isOpaque()) {
+        str->append("opaque");
+    } else {
+        str->append("transparent");
+    }
+    if (this->isImmutable()) {
+        str->append(", immutable");
+    } else {
+        str->append(", not-immutable");
+    }
+    str->append(")");
+
+    str->appendf(" pixelref:%p", this->pixelRef());
+    str->append(")");
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkBitmap::peekPixels(SkPixmap* pmap) const {