GLSurface::Resize implementations release the current context if they are current before resize.

This is because, if the newly allocated surface happens to have the same handle / address, a subsequent MakeCurrent will think that the surface has not changed and early out.
Review URL: http://codereview.chromium.org/8869007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113677 0039d316-1c4b-4281-b951-d872f2087c98

ui/gfx/gl/gl_surface_egl.cc

@@ -12,6 +12,7 @@
 #include "third_party/angle/include/EGL/eglext.h"
 #endif
 #include "ui/gfx/gl/egl_util.h"
+#include "ui/gfx/gl/gl_context.h"
 
 #if defined(OS_ANDROID)
 #include <EGL/egl.h>
@@ -357,9 +358,22 @@ bool PbufferGLSurfaceEGL::Resize(const gfx::Size& size) {
   if (size == size_)
     return true;
 
+  GLContext* current_context = GLContext::GetCurrent();
+  bool was_current = current_context && current_context->IsCurrent(this);
+  if (was_current)
+    current_context->ReleaseCurrent(this);
+
   Destroy();
+
   size_ = size;
-  return Initialize();
+
+  if (!Initialize())
+    return false;
+
+  if (was_current)
+    return current_context->MakeCurrent(this);
+
+  return true;
 }
 
 EGLSurface PbufferGLSurfaceEGL::GetHandle() {

ui/gfx/gl/gl_surface_osmesa.cc

@@ -5,6 +5,7 @@
 #include "ui/gfx/gl/gl_surface_osmesa.h"
 #include "base/logging.h"
 #include "ui/gfx/gl/gl_bindings.h"
+#include "ui/gfx/gl/gl_context.h"
 
 namespace gfx {
 
@@ -21,6 +22,11 @@ bool GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
   if (new_size == size_)
     return true;
 
+  GLContext* current_context = GLContext::GetCurrent();
+  bool was_current = current_context && current_context->IsCurrent(this);
+  if (was_current)
+    current_context->ReleaseCurrent(this);
+
   // Preserve the old buffer.
   scoped_array<int32> old_buffer(buffer_.release());
 
@@ -37,6 +43,10 @@ bool GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
   }
 
   size_ = new_size;
+
+  if (was_current)
+    return current_context->MakeCurrent(this);
+
   return true;
 }