Revert of Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/browser/gpu/browser_gpu_channel_host_factory.cc

Index: content/browser/gpu/browser_gpu_channel_host_factory.cc
diff --git a/content/browser/gpu/browser_gpu_channel_host_factory.cc b/content/browser/gpu/browser_gpu_channel_host_factory.cc
index 4019ccb8fc7125d59ca0d12cfd9e9b961c4b142f..205542cdc81e918839841fbbeb55d99e16c6cadd 100644
--- a/content/browser/gpu/browser_gpu_channel_host_factory.cc
+++ b/content/browser/gpu/browser_gpu_channel_host_factory.cc
@@ -43,37 +43,7 @@
 
 base::LazyInstance<std::set<gfx::GpuMemoryBuffer::Usage>>
     g_enabled_gpu_memory_buffer_usages;
-
-bool IsGpuMemoryBufferFactoryConfigurationSupported(
-    gfx::GpuMemoryBuffer::Format format,
-    gfx::GpuMemoryBuffer::Usage usage,
-    gfx::GpuMemoryBufferType type) {
-  switch (type) {
-    case gfx::SHARED_MEMORY_BUFFER:
-      // Shared memory buffers must be created in-process.
-      return false;
-#if defined(OS_MACOSX)
-    case gfx::IO_SURFACE_BUFFER:
-      return GpuMemoryBufferFactoryIOSurface::
-          IsGpuMemoryBufferConfigurationSupported(format, usage);
-#endif
-#if defined(OS_ANDROID)
-    case gfx::SURFACE_TEXTURE_BUFFER:
-      return GpuMemoryBufferFactorySurfaceTexture::
-          IsGpuMemoryBufferConfigurationSupported(format, usage);
-#endif
-#if defined(USE_OZONE)
-    case gfx::OZONE_NATIVE_BUFFER:
-      return GpuMemoryBufferFactoryOzoneNativeBuffer::
-          IsGpuMemoryBufferConfigurationSupported(format, usage);
-#endif
-    default:
-      NOTREACHED();
-      return false;
-  }
-}
-
-}  // namespace
+}
 
 BrowserGpuChannelHostFactory* BrowserGpuChannelHostFactory::instance_ = NULL;
 
@@ -284,22 +254,16 @@
 }
 
 // static
-uint32 BrowserGpuChannelHostFactory::GetImageTextureTarget(
-    gfx::GpuMemoryBuffer::Format format,
-    gfx::GpuMemoryBuffer::Usage usage) {
-  if (!IsGpuMemoryBufferFactoryUsageEnabled(usage))
+uint32 BrowserGpuChannelHostFactory::GetImageTextureTarget() {
+  if (!IsGpuMemoryBufferFactoryUsageEnabled(gfx::GpuMemoryBuffer::MAP))
     return GL_TEXTURE_2D;
 
   std::vector<gfx::GpuMemoryBufferType> supported_types;
   GpuMemoryBufferFactory::GetSupportedTypes(&supported_types);
   DCHECK(!supported_types.empty());
 
-  // The GPU service will always use the preferred type, if the |format| and
-  // |usage| allows.
+  // The GPU service will always use the preferred type.
   gfx::GpuMemoryBufferType type = supported_types[0];
-
-  if (!IsGpuMemoryBufferFactoryConfigurationSupported(format, usage, type))
-    return GL_TEXTURE_2D;
 
   switch (type) {
     case gfx::SURFACE_TEXTURE_BUFFER:
@@ -507,15 +471,33 @@
   if (!IsGpuMemoryBufferFactoryUsageEnabled(usage))
     return false;
 
+  // Preferred type is always used by factory.
   std::vector<gfx::GpuMemoryBufferType> supported_types;
   GpuMemoryBufferFactory::GetSupportedTypes(&supported_types);
   DCHECK(!supported_types.empty());
-
-  // The GPU service will always use the preferred type, if the |format| and
-  // |usage| allows.
-  gfx::GpuMemoryBufferType type = supported_types[0];
-
-  return IsGpuMemoryBufferFactoryConfigurationSupported(format, usage, type);
+  switch (supported_types[0]) {
+    case gfx::SHARED_MEMORY_BUFFER:
+      // Shared memory buffers must be created in-process.
+      return false;
+#if defined(OS_MACOSX)
+    case gfx::IO_SURFACE_BUFFER:
+      return GpuMemoryBufferFactoryIOSurface::
+          IsGpuMemoryBufferConfigurationSupported(format, usage);
+#endif
+#if defined(OS_ANDROID)
+    case gfx::SURFACE_TEXTURE_BUFFER:
+      return GpuMemoryBufferFactorySurfaceTexture::
+          IsGpuMemoryBufferConfigurationSupported(format, usage);
+#endif
+#if defined(USE_OZONE)
+    case gfx::OZONE_NATIVE_BUFFER:
+      return GpuMemoryBufferFactoryOzoneNativeBuffer::
+          IsGpuMemoryBufferConfigurationSupported(format, usage);
+#endif
+    default:
+      NOTREACHED();
+      return false;
+  }
 }
 
 void BrowserGpuChannelHostFactory::CreateGpuMemoryBuffer(