Make canvas code a bit more resilient to crashes....

base/gfx/platform_canvas_win.cc

Index: base/gfx/platform_canvas_win.cc
===================================================================
--- base/gfx/platform_canvas_win.cc	(revision 4621)
+++ base/gfx/platform_canvas_win.cc	(working copy)
@@ -6,6 +6,7 @@
 
 #include "base/gfx/bitmap_platform_device_win.h"
 #include "base/logging.h"
+#include "base/process_util.h"
 
 #ifdef ARCH_CPU_64_BITS
 #error This code does not work on x64. Please make sure all the base unit tests\
@@ -14,12 +15,42 @@
 
 namespace gfx {
 
+// Crashes the process. This is called when a bitmap allocation fails, and this
+// function tries to determine why it might have failed, and crash on different
+// lines. This allows us to see in crash dumps the most likely reason for the
+// failure. It takes the size of the bitmap we were trying to allocate as its
+// arguments so we can check that as well.
+void CrashForBitmapAllocationFailure(int w, int h) {
+  // The maximum number of GDI objects per process is 10K. If we're very close
+  // to that, it's probably the problem.
+  const int kLotsOfGDIObjs = 9990;
+  CHECK(GetGuiResources(GetCurrentProcess(), GR_GDIOBJECTS) < kLotsOfGDIObjs);
+
+  // If the bitmap is ginormous, then we probably can't allocate it.
+  // We use 64M pixels = 256MB @ 4 bytes per pixel.
+  const int64 kGinormousBitmapPxl = 64000000;
+  CHECK(static_cast<int64>(w) * static_cast<int64>(h) < kGinormousBitmapPxl);
+
+  // If we're using a crazy amount of virtual address space, then maybe there
+  // isn't enough for our bitmap.
+  const int64 kLotsOfMem = 1500000000;  // 1.5GB.
+  scoped_ptr<process_util::ProcessMetrics> process_metrics(
+      process_util::ProcessMetrics::CreateProcessMetrics(GetCurrentProcess()));
+  CHECK(process_metrics->GetPagefileUsage() < kLotsOfMem);
+
+  // Everything else.
+  CHECK(0);
+}
+
+
 PlatformCanvasWin::PlatformCanvasWin() : SkCanvas() {
 }
 
 PlatformCanvasWin::PlatformCanvasWin(int width, int height, bool is_opaque)
     : SkCanvas() {
-  initialize(width, height, is_opaque, NULL);
+  bool initialized = initialize(width, height, is_opaque, NULL);
+  if (!initialized) 
+    CrashForBitmapAllocationFailure(width, height);
 }
 
 PlatformCanvasWin::PlatformCanvasWin(int width,
@@ -27,20 +58,26 @@
                                bool is_opaque,
                                HANDLE shared_section)
     : SkCanvas() {
-  initialize(width, height, is_opaque, shared_section);
+  bool initialized = initialize(width, height, is_opaque, shared_section);
+  if (!initialized) 
+    CrashForBitmapAllocationFailure(width, height);
 }
 
 PlatformCanvasWin::~PlatformCanvasWin() {
 }
 
-void PlatformCanvasWin::initialize(int width,
-                                int height,
-                                bool is_opaque,
-                                HANDLE shared_section) {
+bool PlatformCanvasWin::initialize(int width,
+                                   int height,
+                                   bool is_opaque,
+                                   HANDLE shared_section) {
   SkDevice* device =
       createPlatformDevice(width, height, is_opaque, shared_section);
+  if (!device)
+    return false;
+
   setDevice(device);
   device->unref(); // was created with refcount 1, and setDevice also refs
+  return true;
 }
 
 HDC PlatformCanvasWin::beginPlatformPaint() {